DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Earning Per Share (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
BASIC
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)
Weighted-average common shares outstanding									92,891	89,508	85,837
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
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)
Weighted-average common shares outstanding									92,891	89,508	85,837
Dilutive effect of stock awards									1,620	1,820	0
Weighted-average common shares outstanding on a diluted basis									94,511	91,328	85,837
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)