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Derivatives - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014
Derivative [Line Items] |  |  |
Gain (Loss) on Foreign Currency Fair Value Hedge Derivatives and Not Designated as Hedging Instruments at Fair Value | $ (1,520) | $ (95) | $ (13,500)
Fair Value, Inputs, Level 2 |  |  |
Derivative [Line Items] |  |  |
Foreign Currency Contracts Net Assets (Liabilities) Fair Value Disclosure | (680) | (234) |
Cash Flow Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  | 500 |
Fair Value Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 143,400 | $ 170,700 |

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- Definition Foreign Currency Contracts Net Assets (Liabilities) Fair Value Disclosure + References No definition available. + Details
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Namespace Prefix: | atu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Gain (Loss) on Foreign Currency Fair Value Hedge Derivatives and Not Designated as Hedging Instruments at Fair Value + References No definition available. + Details
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Namespace Prefix: | atu_
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Balance Type: | credit
Period Type: | duration

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Namespace Prefix: | invest_
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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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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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