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Contingencies and Litigation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Nov. 30, 2012 | Aug. 31, 2012
--- | --- | ---
Commitments and Contingencies Disclosure [Line Items] |  |
Outstanding letters of credit | $ 10.9 | $ 8.5
Discounted present value of future minimum lease payments | $ 12 |

X
- Details
Name: | atu_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix: | atu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Discounted present value of future minimum lease payments. + References No definition available. + Details
Name: | atu_DiscountedPresentValueOfFutureMinimumLeasePayments
Namespace Prefix: | atu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant