Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Jan. 01, 2012	Oct. 02, 2011	Jul. 03, 2011	Apr. 03, 2011	Jan. 02, 2011	Sep. 30, 2012	Oct. 02, 2011	Oct. 03, 2010
Quarterly Financial Information Disclosure [Abstract]
Net Sales	$ 263,074	$ 259,195	$ 249,306	$ 240,920	$ 227,291	$ 216,722	$ 207,490	$ 184,351	$ 1,012,495	$ 835,854	$ 518,268
Gross profit	150,426	144,593	131,868	125,736	129,875	123,631	92,636	95,029	552,623	441,171	248,211
Net income	$ 11,593	$ 8,126	$ (4,792)	$ (44,602)	$ 43,376	$ 32,778	$ (19,128)	$ (1,296)	$ (29,675)	$ 55,730	$ 59,038
Basic earnings (loss) per share	$ 0.13	$ 0.09	$ (0.06)	$ (0.52)	$ 0.51	$ 0.39	$ (0.23)	$ (0.02)	$ (0.35)	$ 0.66	$ 0.73
Diluted earnings (loss) per share	$ 0.13	$ 0.09	$ (0.06)	$ (0.52)	$ 0.50	$ 0.38	$ (0.23)	$ (0.02)	$ (0.35)	$ 0.65	$ 0.72