Reconciliation of Income Taxes at Federal Statutory Rate to Effective Tax Rate (Parenthetical) (Detail)	12 Months Ended
Aug. 31, 2010
Reconciliation of Effective Income Tax Rate [Line Items]
Provision to return adjustments and additional provisions for unrecognized tax benefits	11.10%

Effective Income Tax Rate Reconciliation Tax Provision Adjustments

No definition available.

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Namespace Prefix:	atu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration