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		9 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Basic EPS:
Net income available to common shareholders, Income	$ 4,687	$ 13,725	$ 12,874	$ 20,652
Net income available to common shareholders, Shares	49,148	48,173	48,732	48,037
Net income available to common shareholders, Per Share	$ 0.10	$ 0.28	$ 0.26	$ 0.43
Effect of dilutive securities:
Options to purchase common stock, Shares	154	141	35	284
Options to purchase common stock, Per Share	$ 0	$ 0	$ 0	$ 0
Restricted shares, Shares	539	508	434	445
Restricted shares, Per Share	$ (0.01)	$ 0	$ 0	$ (0.01)
Diluted EPS:
Net income available to common shareholders, Income	$ 4,687	$ 13,725	$ 12,874	$ 20,652
Net income available to common shareholders, Shares	49,841	48,822	49,201	48,766
Net income available to common shareholders, Per Share	$ 0.09	$ 0.28	$ 0.26	$ 0.42