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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. 29, 2019	Jul. 07, 2019	Apr. 14, 2019	Sep. 30, 2018	Jul. 08, 2018	Apr. 15, 2018	Jan. 20, 2019	Jan. 21, 2018	Sep. 29, 2019		Sep. 30, 2018		Oct. 01, 2017
Selected Quarterly Financial Information [Abstract]
Revenues	$ 221,235	$ 222,359	$ 215,727	$ 177,472	$ 187,983	$ 209,772	$ 290,786	$ 294,463	$ 950,107		$ 869,690		$ 1,097,291
Earnings from operations	48,515	48,261	47,123	35,647	76,340	46,820	58,324	72,807	202,223		233,447		245,413
Net earnings	$ 22,061	$ 13,189	$ 25,089	$ 16,269	$ 45,307	$ 47,605	$ 34,098	$ 12,190	$ 94,437		$ 121,371		$ 135,332
Net earnings per share, Basic (in usd per share)	$ 0.86	$ 0.51	$ 0.97	$ 0.61	$ 1.62	$ 1.64	$ 1.32	$ 0.41	$ 3.66	[1]	$ 4.26	[1]	$ 4.42	[1]
Net earnings per share, Diluted (in usd per share)	$ 0.85	$ 0.50	$ 0.96	$ 0.60	$ 1.60	$ 1.62	$ 1.31	$ 0.41	$ 3.62	[1]	$ 4.21	[1]	$ 4.38	[1]
[1] Earnings per share may not add due to rounding.

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