Earnings per Share (EPS) and Common Stock (Earnings per Share Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Earnings Per Share and Common Stock
Net income (loss)	$ 7,156	$ (43,513)	$ 42,611	$ (22,528)
Weighted-average shares outstanding—Basic	115,606	118,461	115,401	118,392
Dilutive effect of employee stock options, restricted shares and restricted stock units (in shares)	411	0	455	0
Weighted-average shares outstanding—Diluted	116,017	118,461	115,856	118,392
Earnings per share—Basic (in USD per share)	$ 0.06	$ (0.37)	$ 0.37	$ (0.19)
Earnings per share—Diluted (in USD per share)	$ 0.06	$ (0.37)	$ 0.37	$ (0.19)