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Director & Officer Transition Charges Director & Officer Transition Charges (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Director & Officer Transition Charges [Abstract] |  |  |
Director & officer transition charges | $ 0 | $ 0 | $ 7,784

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- Definition Director & Officer Transition Charges [Abstract] + References No definition available. + Details
Name: | atu_DirectorOfficerTransitionChargesAbstract
Namespace Prefix: | atu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Director & officer transition charges including compensation expense for accelerated equity vesting, severance, outplacement, legal, signing bonus and relocation costs. + References No definition available. + Details
Name: | atu_Directorofficertransitioncharges
Namespace Prefix: | atu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration