Supplemental Pro Forma Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jan. 01, 2012	Jan. 02, 2011
Business Acquisition, Pro Forma Information [Line Items]
Net sales	$ 247,754	$ 266,746
Net loss	$ (18,258)	$ (10,129)
Net loss per share
Basic	$ (0.21)	$ (0.12)
Diluted	$ (0.21)	$ (0.12)