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Unaudited Quarterly Results of Operations (Quarterly Results of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 27, 2020	Jul. 05, 2020	Apr. 12, 2020	Sep. 29, 2019	Jul. 07, 2019	Apr. 14, 2019	Jan. 19, 2020	Jan. 20, 2019	Sep. 27, 2020		Sep. 29, 2019		Sep. 30, 2018
Selected Quarterly Financial Information [Abstract]
Revenues	$ 255,401	$ 242,275	$ 216,157	$ 221,235	$ 222,359	$ 215,727	$ 307,673	$ 290,786	$ 1,021,506		$ 950,107		$ 869,690
Earnings from operations	66,002	61,790	32,842	48,515	48,261	47,123	69,950	58,324	230,584		202,223		233,447
Net earnings	$ 37,849	$ 32,555	$ 11,463	$ 22,061	$ 13,189	$ 25,089	$ 7,897	$ 34,098	$ 89,764		$ 94,437		$ 121,371
Net earnings per share, Basic (in usd per share)	$ 1.65	$ 1.42	$ 0.50	$ 0.86	$ 0.51	$ 0.97	$ 0.33	$ 1.32	$ 3.88	[1]	$ 3.66	[1]	$ 4.26	[1]
Net earnings per share, Diluted (in usd per share)	$ 1.64	$ 1.42	$ 0.50	$ 0.85	$ 0.50	$ 0.96	$ 0.33	$ 1.31	$ 3.86	[1]	$ 3.62	[1]	$ 4.21	[1]
[1] Earnings per share may not add due to rounding.

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