Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Oct. 03, 2015	Sep. 27, 2014	Sep. 28, 2013
Earnings Per Share [Abstract]
Weighted average shares outstanding—basic (1)									24,754,000	24,760,000	24,138,000
Dilutive effect of employee awards									238,000	316,000	417,000
Weighted average shares outstanding—diluted									24,992,000	25,076,000	24,555,000
Net income	$ 27,302	$ 13,264	$ 18,413	$ 17,430	$ 19,097	$ 12,999	$ 15,307	$ 11,703	$ 76,409	$ 59,106	$ 66,355
Net income (loss)—basic (usd per share)	$ 1.11	$ 0.54	$ 0.75	$ 0.70	$ 0.77	$ 0.52	$ 0.62	$ 0.48	$ 3.09	$ 2.39	$ 2.75
Net income (loss)—diluted (usd per share)	$ 1.10	$ 0.53	$ 0.74	$ 0.69	$ 0.76	$ 0.52	$ 0.61	$ 0.47	$ 3.06	$ 2.36	$ 2.70
Dilutive securities excluded from calculation of dilutive shares										47,242	883