Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 27, 2014	Oct. 01, 2016	Oct. 03, 2015	Sep. 27, 2014
Earnings Per Share [Abstract]
Weighted average shares outstanding—basic (shares)									24,142,000	24,754,000	24,760,000
Dilutive effect of employee awards (shares)									273,000	238,000	316,000
Weighted average shares outstanding—diluted (shares)									24,415,000	24,992,000	25,076,000
Net income	$ 30,785	$ 18,650	$ 17,781	$ 20,286	$ 27,302	$ 13,264	$ 18,413	$ 17,430	$ 87,502	$ 76,409	$ 59,106
Net income (loss)—basic (usd per share)	$ 1.27	$ 0.77	$ 0.74	$ 0.85	$ 1.11	$ 0.54	$ 0.75	$ 0.70	$ 3.62	$ 3.09	$ 2.39
Net income (loss)—diluted (usd per share)	$ 1.25	$ 0.76	$ 0.73	$ 0.84	$ 1.10	$ 0.53	$ 0.74	$ 0.69	$ 3.58	$ 3.06	$ 2.36
Dilutive securities excluded from calculation of dilutive shares (shares)									323	0	47,242