Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2012
Quarterly Financial Information Disclosure [Abstract]
Net Sales	$ 303,315	$ 292,301	$ 287,016	$ 255,631	$ 250,383	$ 242,630	$ 235,333	$ 247,598	$ 1,138,263	$ 975,944	$ 1,012,495
Gross profit	170,966	153,590	148,639	138,308	142,838	138,312	133,465	142,573	611,503	557,188	552,623
Net income (loss)	$ 32,797	$ (4,293)	$ (6,759)	$ 1,379	$ 14,086	$ 18,279	$ (2,905)	$ 14,214	$ 23,123	$ 43,674	$ (29,675)
Basic earnings (loss) per share	$ 0.35	$ (0.05)	$ (0.07)	$ 0.01	$ 0.16	$ 0.20	$ (0.03)	$ 0.16	$ 0.25	$ 0.49	$ (0.35)
Diluted earnings (loss) per share	$ 0.34	$ (0.05)	$ (0.07)	$ 0.01	$ 0.15	$ 0.20	$ (0.03)	$ 0.16	$ 0.24	$ 0.48	$ (0.35)