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Product Warranty Costs - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Nov. 30, 2011
Warranty Liability [Line Items] |
Purchase accounting adjustment | $ (5,719)

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- Details
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Namespace Prefix: | atu_
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Balance Type: | na
Period Type: | duration

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- Definition Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard and extended product warranties (including adjustments for changes in estimates). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(4)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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Period Type: | duration