Earnings Per Share (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Weighted average shares outstanding—basic	24,761,000	24,496,000	24,698,000	24,422,000
Dilutive effect of employee awards	249,000	261,000	320,000	278,000
Weighted average shares outstanding—diluted	25,010,000	24,757,000	25,018,000	24,700,000
Total income from continuing operations	$ 65,302	$ 42,188	$ 107,205	$ 72,886
Loss from discontinued operations, net of income taxes	0	(343)	(2)	(633)
Net income	$ 65,302	$ 41,845	$ 107,203	$ 72,253
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Dilutive securities excluded from calculation of dilutive shares	32,221	0	25,864	2,042