Earnings Per Share - Numerators and Denominators in Basic and Diluted Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 23, 2012	Mar. 24, 2012	Dec. 24, 2011	Sep. 28, 2013	Sep. 29, 2012	Sep. 24, 2011
Basic EPS:
Net income (loss) available to common shareholders, Net Income									$ (1,929)	$ 21,173	$ 28,323
Net income (loss) available to common shareholders, Shares	48,264	48,173	48,064	47,871	47,704	47,661	47,343	47,823	48,094	47,622	56,217
Net income (loss) available to common shareholders, Per Share	$ (0.47)	$ 0.28	$ 0.46	$ (0.32)	$ (0.21)	$ 0.48	$ 0.46	$ (0.27)	$ (0.04)	$ 0.44	$ 0.50
Effect of dilutive securities:
Options to purchase common stock, Shares									0	497	274
Options to purchase common stock, Per Share									$ 0	$ 0	$ 0
Restricted shares, Shares									0	255	154
Restricted shares, Per Share									$ 0	$ 0	$ 0
Diluted EPS:
Net income (loss) available to common shareholders, Net Income									$ (1,929)	$ 21,173	$ 28,323
Net income (loss) available to common shareholders, Shares	48,264	48,822	48,740	47,871	47,704	48,388	48,036	47,823	48,094	48,374	56,645
Net income (loss) available to common shareholders, Per Share	$ (0.47)	$ 0.28	$ 0.46	$ (0.32)	$ (0.21)	$ 0.47	$ 0.45	$ (0.27)	$ (0.04)	$ 0.44	$ 0.50