Accounts Receivable Securitization - Additional Information (Detail) (USD $)	1 Months Ended
Sep. 09, 2009
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Expiration of accounts receivable securitization program	$ 37,100

Expiration of Accounts Receivable Securitization Program

No definition available.

Name:	atu_ExpirationOfAccountsReceivableSecuritizationProgram
Namespace Prefix:	atu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration