|
Income Taxes - Additional Information (Details) (USD $)
|
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
|
Feb. 28, 2015
|
Feb. 28, 2014
|
Feb. 28, 2015
|
Feb. 28, 2014
|
Aug. 31, 2014
|
|
| Income Tax Disclosure [Abstract] | |||||
| Effective Tax Rate | (3.10%)atu_EffectiveTaxRate | 29.00%atu_EffectiveTaxRate | (32.10%)atu_EffectiveTaxRate | 17.60%atu_EffectiveTaxRate | |
| Impairment charge | $ 84,353,000us-gaap_AssetImpairmentCharges | $ 0us-gaap_AssetImpairmentCharges | $ 84,353,000us-gaap_AssetImpairmentCharges | $ 0us-gaap_AssetImpairmentCharges | |
| Asset Impairment Charge Income Tax Benefit | 1,700,000atu_AssetImpairmentChargeIncomeTaxBenefit | ||||
| Effective Income Tax Rate (Excluding Asset Impairment Charge) | 17.20%atu_EffectiveIncomeTaxRateExcludingAssetImpairmentCharge | 21.30%atu_EffectiveIncomeTaxRateExcludingAssetImpairmentCharge | |||
| Discrete item | 7,300,000atu_Discreteitem | ||||
| Unrecognized Tax Benefits | 33,200,000us-gaap_UnrecognizedTaxBenefits | 33,200,000us-gaap_UnrecognizedTaxBenefits | 32,300,000us-gaap_UnrecognizedTaxBenefits | ||
| Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 2,300,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | $ 2,300,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | $ 2,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | ||
| X | ||||||||||
|
- Definition
Asset Impairment Charge Income Tax Benefit No definition available.
|
| X | ||||||||||
|
- Definition
Discrete item No definition available.
|
| X | ||||||||||
|
- Definition
Effective Income Tax Rate (Excluding Asset Impairment Charge) No definition available.
|
| X | ||||||||||
|
- Definition
Effective Tax Rate No definition available.
|
| X | ||||||||||
|
- Definition
Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|