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
	Dec. 31, 2020	Dec. 28, 2019
Earnings Per Share And Common Stock [Abstract]
Net income	$ 23,515	$ 35,455
Weighted-average shares outstanding—Basic	116,401	115,190
Dilutive effect of restricted stock units	1,204	501
Weighted-average shares outstanding—Diluted	117,605	115,691
Earnings per share—Basic	$ 0.20	$ 0.31
Earnings per share—Diluted	$ 0.20	$ 0.31