Earnings Per Share (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Weighted average shares outstanding—basic (in shares)	24,658,000	24,537,000	24,684,000	24,460,000
Dilutive effect of employee stock awards (in shares)	219,000	286,000	287,000	281,000
Weighted average shares outstanding—diluted (in shares)	24,877,000	24,823,000	24,971,000	24,741,000
Net income from continuing operations	$ 66,970	$ 62,871	$ 174,175	$ 135,757
Loss from discontinued operations, net of income taxes	0	(1,754)	(2)	(2,387)
Net income	$ 66,970	$ 61,117	$ 174,173	$ 133,370
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Dilutive securities excluded from calculation of dilutive shares	114,489	0	25,864	0