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Contingencies and Litigation - Additional Information (Details) - USD ($) $ in Millions | Nov. 30, 2017 | Aug. 31, 2017
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Commitments and Contingencies Disclosure [Abstract] |  |
Outstanding letters of credit | $ 14.3 | $ 14.5
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Discounted present value of future minimum lease payments | $ 12.8 |
Weighted Average Discount Rate on Future Minimum Lease Payments | 2.62% |

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

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- Definition Weighted Average Discount Rate used on Future Minimum Lease Payments of lease payments the Company remains contingently liable for due to previously divested businesses + References No definition available. + Details
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Namespace Prefix: | atu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant