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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. 28, 2019	Dec. 29, 2018
Earnings Per Share and Common Stock
Net income	$ 35,455	$ 20,985
Weighted-average shares outstanding—Basic	115,190	118,323
Dilutive effect of employee stock options, restricted shares and restricted stock units (in shares)	501	1,315
Weighted-average shares outstanding—Diluted	115,691	119,638
Earnings per share—Basic (in USD per share)	$ 0.31	$ 0.18
Earnings per share—Diluted (in USD per share)	$ 0.31	$ 0.18

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