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Fair Value Measurement - Additional Information (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||||
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Feb. 28, 2015
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Feb. 28, 2014
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Feb. 28, 2015
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Feb. 28, 2014
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Aug. 31, 2014
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Apr. 16, 2012
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||
| Impairment charge | $ 84,353,000us-gaap_AssetImpairmentCharges | $ 0us-gaap_AssetImpairmentCharges | $ 84,353,000us-gaap_AssetImpairmentCharges | $ 0us-gaap_AssetImpairmentCharges | ||
| Senior Notes | 5.625% Senior Notes | ||||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||
| Debt Instrument, 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 |
300,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = atu_FivePointSixTwoFiveSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
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| 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 |
5.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = atu_FivePointSixTwoFiveSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
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| Fair value of long-term debt |
$ 313,500,000us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = atu_FivePointSixTwoFiveSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
$ 313,500,000us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = atu_FivePointSixTwoFiveSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
$ 315,800,000us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = atu_FivePointSixTwoFiveSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
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- Definition
Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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
Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. No definition available.
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- Details
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