Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 01, 2011
Related Party Transaction [Line Items]
Purchase of treasury stock from related party	$ 5,612
Treasury Stock [Member]
Related Party Transaction [Line Items]
Purchase of treasury stock from related party, shares	1,371
Purchase of treasury stock from related party	$ 5,612

Number of shares that have been repurchased during the period from related parties and are being held in treasury.

No definition available.

Name:	atx_TreasuryStockSharesAcquiredFromRelatedParties
Namespace Prefix:	atx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration