Earnings Per Share - Reconciliation of Amounts Utilized in Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ 12,290	$ 29,295	$ (86,203)	$ 57,474
Basic weighted average common shares outstanding (in shares)	33,538	33,703	33,552	33,619
Dilutive effect of share-based awards outstanding (in shares)	849	999	0	1,012
Diluted weighted average shares outstanding (in shares)	34,387	34,702	33,552	34,631
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.37	$ 0.87	$ (2.57)	$ 1.71
Diluted (in dollars per share)	$ 0.36	$ 0.84	$ (2.57)	$ 1.66