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Quarterly Financial Data - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |
Impairment & divestiture charges | $ 6,200 | $ (13,000) | $ 6,100 | $ 23,500 | $ 22,827 | $ 2,987 | $ 116,979

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- Definition Impairment & divestiture charges related to the disposition of business + References No definition available. + Details
Name: | atu_Impairmentdivestiturecharges
Namespace Prefix: | atu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_QuarterlyFinancialInformationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration