Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Earnings Per Share [Abstract]
Weighted average shares outstanding—basic (shares)									24,487,000	24,142,000	24,754,000
Dilutive effect of employee awards (shares)									290,000	273,000	238,000
Weighted average shares outstanding—diluted (shares)									24,777,000	24,415,000	24,992,000
Income (Loss) from continuing operations									$ 208,644	$ 87,502	$ 76,409
Loss from discontinued operations, net of income taxes									(1,522)	0	0
Net income	$ 73,752	$ 61,117	$ 41,845	$ 30,408	$ 30,785	$ 18,650	$ 17,781	$ 20,286	$ 207,122	$ 87,502	$ 76,409
Dilutive securities excluded from calculation of dilutive shares (shares)									505	323	0