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Debt - Additional Information (Detail) (USD $)
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3 Months Ended | 0 Months Ended |
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Nov. 30, 2014
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Apr. 16, 2012
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| Debt Instrument [Line Items] | ||
| Senior credit facility expansion option, available | 350,000,000atu_LineOfCreditFacilityAdditionalExpansionOptionAvailable | |
| Debt Instrument, actual interest rate | 1.45%us-gaap_DebtInstrumentInterestRateAtPeriodEnd | |
| Libor Rate | ||
| Debt Instrument [Line Items] | ||
| Debt instrument, interest rate over variable rate |
1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
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| Revolving Credit Facility | ||
| Debt Instrument [Line Items] | ||
| Maximum borrowing capacity |
600,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |
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| Senior Credit Facility - Term Loan | ||
| Debt Instrument [Line Items] | ||
| Maximum borrowing capacity |
90,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = atu_SeniorCreditFacilityTermLoanMember |
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| Senior Credit Facility - Term Loan | Starting on September 30, 2014 | ||
| Debt Instrument [Line Items] | ||
| Quarterly installments, payable on term loan |
1,100,000atu_LineOfCreditFacilityInstallmentPayments / us-gaap_CreditFacilityAxis = atu_SeniorCreditFacilityTermLoanMember / atu_PeriodAxis = atu_PeriodOneMember |
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| Senior Credit Facility - Term Loan | starting on September 30, 2015 | ||
| Debt Instrument [Line Items] | ||
| Quarterly installments, payable on term loan |
2,300,000atu_LineOfCreditFacilityInstallmentPayments / us-gaap_CreditFacilityAxis = atu_SeniorCreditFacilityTermLoanMember / atu_PeriodAxis = atu_PeriodThreeMember |
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| Line of Credit | Senior Credit Facility - Revolver | ||
| Debt Instrument [Line Items] | ||
| Unused credit line |
474,400,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_DebtInstrumentAxis = atu_SeniorCreditFacilityRevolverMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |
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| Unused credit line Available for Borrowing, Amount |
466,400,000atu_DebtInstrumentUnusedBorrowingCapacityAvailableforBorrowingAmount / us-gaap_DebtInstrumentAxis = atu_SeniorCreditFacilityRevolverMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |
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| Senior Notes | 5.625% Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Face amount |
300,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = atu_FivePointSixTwoFiveSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
300,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = atu_FivePointSixTwoFiveSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
| Debt instrument, interest rate |
5.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = atu_FivePointSixTwoFiveSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
5.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = atu_FivePointSixTwoFiveSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
| Minimum [Member] | ||
| Debt Instrument [Line Items] | ||
| Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |
0.15%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Interest coverage ratio |
3.50atu_Interestcoverageratio / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Minimum [Member] | Libor Rate | ||
| Debt Instrument [Line Items] | ||
| Debt instrument, interest rate over variable rate |
1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
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| Minimum [Member] | Base Rate | ||
| Debt Instrument [Line Items] | ||
| Debt instrument, interest rate over variable rate |
0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |
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| Minimum [Member] | Senior Notes | 5.625% Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Debt Instrument, Redemption Price, Percentage |
100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentAxis = atu_FivePointSixTwoFiveSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Maximum [Member] | ||
| Debt Instrument [Line Items] | ||
| Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |
0.40%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| Leverage ratio |
3.75atu_LeverageRatio / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| Maximum [Member] | Libor Rate | ||
| Debt Instrument [Line Items] | ||
| Debt instrument, interest rate over variable rate |
2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
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| Maximum [Member] | Base Rate | ||
| Debt Instrument [Line Items] | ||
| Debt instrument, interest rate over variable rate |
1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |
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| Maximum [Member] | Senior Notes | 5.625% Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Debt Instrument, Redemption Price, Percentage |
102.80%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentAxis = atu_FivePointSixTwoFiveSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
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- Definition
Debt Instrument, Unused Borrowing Capacity Available for Borrowing, Amount No definition available.
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- Definition
Interest coverage ratio No definition available.
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- Definition
Leverage ratio. No definition available.
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- Definition
Line of credit facility additional expansion option available No definition available.
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- Definition
Line of Credit Facility, Installment Payments No definition available.
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- Definition
Percentage points added to the reference rate to compute the variable rate on the debt instrument. No definition available.
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- Definition
Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The effective interest rate at the end of the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. No definition available.
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