Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Statements of Cash Flows (Details)

v2.4.1.9
Condensed Consolidating Statements of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Operating Activities    
Cash provided by (used in) operating activities $ (9,619)us-gaap_NetCashProvidedByUsedInOperatingActivities $ 36,883us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing Activities    
Capital expenditures (12,877)us-gaap_PaymentsToAcquireProductiveAssets (22,226)us-gaap_PaymentsToAcquireProductiveAssets
Proceeds from sale of property, plant and equipment 707us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 2,008us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Proceeds from sale of businesses, net of transaction costs   243,386us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
Intercompany investment 0atu_IntercompanyInvestment 0atu_IntercompanyInvestment
Cash (used in) provided by investing activities (12,170)us-gaap_NetCashProvidedByUsedInInvestingActivities 223,168us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing Activities    
Purchase of treasury shares (180,512)us-gaap_PaymentsForRepurchaseOfCommonStock (109,095)us-gaap_PaymentsForRepurchaseOfCommonStock
Intercompany Loan Activity 0atu_IntercompanyLoanActivity 0atu_IntercompanyLoanActivity
Intercompany Capital Contribution 0atu_IntercompanyCapitalContribution 0atu_IntercompanyCapitalContribution
Stock option exercises, related tax benefits and other 4,753atu_StockOptionExercisesRelatedTaxBenefitsAndOther 25,803atu_StockOptionExercisesRelatedTaxBenefitsAndOther
Payment of contingent acquisition consideration 0atu_PaymentofContingentConsideration (753)atu_PaymentofContingentConsideration
Cash dividend (2,598)us-gaap_PaymentsOfDividends (2,919)us-gaap_PaymentsOfDividends
Cash provided by (used in) financing activities 18,393us-gaap_NetCashProvidedByUsedInFinancingActivities (211,964)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash (18,119)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 2,944us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net (decrease) increase in cash and cash equivalents (21,515)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 51,031us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents – beginning of period 109,012us-gaap_CashAndCashEquivalentsAtCarryingValue 103,986us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents – end of period 87,497us-gaap_CashAndCashEquivalentsAtCarryingValue 155,017us-gaap_CashAndCashEquivalentsAtCarryingValue
Line of Credit | Senior Credit Facility - Revolver    
Financing Activities    
Net borrowings (repayments) on revolver and other debt 199,000us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= atu_SeniorCreditFacilityRevolverMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(125,000)us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= atu_SeniorCreditFacilityRevolverMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Line of Credit | Senior Credit Facility - Term Loan    
Financing Activities    
Net borrowings (repayments) on revolver and other debt (2,250)us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= atu_SeniorCreditFacilityTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= atu_SeniorCreditFacilityTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Parent    
Operating Activities    
Cash provided by (used in) operating activities 18,035us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(223)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Investing Activities    
Capital expenditures (519)us-gaap_PaymentsToAcquireProductiveAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(2,424)us-gaap_PaymentsToAcquireProductiveAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from sale of property, plant and equipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from sale of businesses, net of transaction costs   (4,134)us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Intercompany investment (1,117)atu_IntercompanyInvestment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0atu_IntercompanyInvestment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash (used in) provided by investing activities (1,636)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(6,557)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Financing Activities    
Purchase of treasury shares (180,512)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(109,095)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Intercompany Loan Activity 57,170atu_IntercompanyLoanActivity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(213,449)atu_IntercompanyLoanActivity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Intercompany Capital Contribution 0atu_IntercompanyCapitalContribution
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0atu_IntercompanyCapitalContribution
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Stock option exercises, related tax benefits and other 4,753atu_StockOptionExercisesRelatedTaxBenefitsAndOther
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
25,803atu_StockOptionExercisesRelatedTaxBenefitsAndOther
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Payment of contingent acquisition consideration   0atu_PaymentofContingentConsideration
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash dividend (2,598)us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(2,919)us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash provided by (used in) financing activities (38,777)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,238us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Effect of exchange rate changes on cash 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net (decrease) increase in cash and cash equivalents (22,378)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(4,542)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents – beginning of period 27,931us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
16,122us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents – end of period 5,553us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
11,580us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Parent | Line of Credit | Senior Credit Facility - Revolver    
Financing Activities    
Net borrowings (repayments) on revolver and other debt 199,000us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= atu_SeniorCreditFacilityRevolverMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(125,000)us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= atu_SeniorCreditFacilityRevolverMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Parent | Line of Credit | Senior Credit Facility - Term Loan    
Financing Activities    
Net borrowings (repayments) on revolver and other debt (2,250)us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= atu_SeniorCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Guarantors    
Operating Activities    
Cash provided by (used in) operating activities (41,149)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
8,331us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Investing Activities    
Capital expenditures (2,447)us-gaap_PaymentsToAcquireProductiveAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(2,379)us-gaap_PaymentsToAcquireProductiveAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Proceeds from sale of property, plant and equipment 198us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
74us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Proceeds from sale of businesses, net of transaction costs   214,268us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Intercompany investment 0atu_IntercompanyInvestment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(99,963)atu_IntercompanyInvestment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash (used in) provided by investing activities (2,249)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
112,000us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Financing Activities    
Purchase of treasury shares 0us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Intercompany Loan Activity (42,010)atu_IntercompanyLoanActivity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
120,305atu_IntercompanyLoanActivity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Intercompany Capital Contribution 0atu_IntercompanyCapitalContribution
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0atu_IntercompanyCapitalContribution
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Stock option exercises, related tax benefits and other 0atu_StockOptionExercisesRelatedTaxBenefitsAndOther
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0atu_StockOptionExercisesRelatedTaxBenefitsAndOther
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Payment of contingent acquisition consideration   0atu_PaymentofContingentConsideration
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash dividend 0us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash provided by (used in) financing activities 42,010us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(120,305)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Effect of exchange rate changes on cash 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net (decrease) increase in cash and cash equivalents (1,388)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
26us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents – beginning of period 3,325us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents – end of period 1,937us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
26us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Guarantors | Line of Credit | Senior Credit Facility - Revolver    
Financing Activities    
Net borrowings (repayments) on revolver and other debt 0us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= atu_SeniorCreditFacilityRevolverMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= atu_SeniorCreditFacilityRevolverMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Guarantors | Line of Credit | Senior Credit Facility - Term Loan    
Financing Activities    
Net borrowings (repayments) on revolver and other debt 0us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= atu_SeniorCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Non-Guarantors    
Operating Activities    
Cash provided by (used in) operating activities 13,495us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
43,491us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Investing Activities    
Capital expenditures (9,911)us-gaap_PaymentsToAcquireProductiveAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(17,423)us-gaap_PaymentsToAcquireProductiveAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Proceeds from sale of property, plant and equipment 509us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,933us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Proceeds from sale of businesses, net of transaction costs   33,252us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Intercompany investment 0atu_IntercompanyInvestment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0atu_IntercompanyInvestment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash (used in) provided by investing activities (9,402)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
17,762us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Financing Activities    
Purchase of treasury shares 0us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Intercompany Loan Activity (15,160)atu_IntercompanyLoanActivity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
93,144atu_IntercompanyLoanActivity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Intercompany Capital Contribution 1,117atu_IntercompanyCapitalContribution
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
99,963atu_IntercompanyCapitalContribution
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Stock option exercises, related tax benefits and other 0atu_StockOptionExercisesRelatedTaxBenefitsAndOther
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0atu_StockOptionExercisesRelatedTaxBenefitsAndOther
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Payment of contingent acquisition consideration   (753)atu_PaymentofContingentConsideration
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash dividend 0us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(14,716)us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash provided by (used in) financing activities 16,277us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(8,650)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Effect of exchange rate changes on cash (18,119)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
2,944us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net (decrease) increase in cash and cash equivalents 2,251us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
55,547us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents – beginning of period 77,756us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
87,864us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents – end of period 80,007us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
143,411us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Non-Guarantors | Line of Credit | Senior Credit Facility - Revolver    
Financing Activities    
Net borrowings (repayments) on revolver and other debt 0us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= atu_SeniorCreditFacilityRevolverMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= atu_SeniorCreditFacilityRevolverMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Non-Guarantors | Line of Credit | Senior Credit Facility - Term Loan    
Financing Activities    
Net borrowings (repayments) on revolver and other debt 0us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= atu_SeniorCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Eliminations    
Operating Activities    
Cash provided by (used in) operating activities 0us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(14,716)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Investing Activities    
Capital expenditures 0us-gaap_PaymentsToAcquireProductiveAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsToAcquireProductiveAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Proceeds from sale of property, plant and equipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Proceeds from sale of businesses, net of transaction costs   0us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Intercompany investment 1,117atu_IntercompanyInvestment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
99,963atu_IntercompanyInvestment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Cash (used in) provided by investing activities 1,117us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
99,963us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Financing Activities    
Purchase of treasury shares 0us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Intercompany Loan Activity 0atu_IntercompanyLoanActivity
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0atu_IntercompanyLoanActivity
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Intercompany Capital Contribution (1,117)atu_IntercompanyCapitalContribution
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(99,963)atu_IntercompanyCapitalContribution
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Stock option exercises, related tax benefits and other 0atu_StockOptionExercisesRelatedTaxBenefitsAndOther
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0atu_StockOptionExercisesRelatedTaxBenefitsAndOther
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Payment of contingent acquisition consideration   0atu_PaymentofContingentConsideration
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Cash dividend 0us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
14,716us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Cash provided by (used in) financing activities (1,117)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(85,247)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Effect of exchange rate changes on cash 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Net (decrease) increase in cash and cash equivalents 0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Cash and cash equivalents – beginning of period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
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Financing Activities    
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Eliminations | Line of Credit | Senior Credit Facility - Term Loan    
Financing Activities    
Net borrowings (repayments) on revolver and other debt $ 0us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
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