Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Shares At Cost	Stock Employee Compensation Trust (SECT)	Supplemental Retirement Plan (SERP) Trust	Accumulated Other Comprehensive (Loss) Income	Class A Common Stock	Class A Common Stock Treasury Shares At Cost	Class A Common Stock Stock Employee Compensation Trust (SECT)	Class B Common Stock	Class B Common Stock Treasury Shares At Cost	Class B Common Stock Stock Employee Compensation Trust (SECT)	Class B Common Stock Supplemental Retirement Plan (SERP) Trust
Beginning of year at Sep. 29, 2018		$ 51,280	$ 502,257	$ 1,974,125	$ (738,494)	$ (118,449)	$ (72,941)	$ (372,792)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares			(1,018)		9,880
Equity-based compensation expense			6,464
Adjustments to market - SECT, SERP and other			2,843
Net earnings	$ 174,548			174,548
Dividends (1)				(34,857)
Adoption of 606 | Accounting Standards Update 2014-09				14,923
Class A and B shares purchased					(40,955)
Issuance of shares						22,190	4,293
Purchase of shares - SECT	(15,288)					(15,288)
Adjustment to market						55	(2,898)
Other comprehensive income (loss)	(42,685)							(42,685)
End of year at Sep. 28, 2019	$ 1,322,481	51,280	510,546	2,128,739	(769,569)	(111,492)	(71,546)	(415,477)
Beginning of year - Common stock at Sep. 29, 2018									43,784,489			7,495,224
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Class B to Class A									10,446			(10,446)
End of year - Common stock at Sep. 28, 2019									43,794,935			7,484,778
Beginning of year - Shares at Sep. 29, 2018										(10,872,575)	(425,148)		(3,323,996)	(983,772)	(876,170)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued related to equity awards										109,005			148,017
Shares purchased										(337,942)			(169,510)
Shares issued														270,675	50,000
Purchase of shares - SECT														(173,203)
End of year - Shares at Sep. 28, 2019										(11,101,512)	(425,148)		(3,345,489)	(886,300)	(826,170)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 1.00
Issuance of shares			142		11,887
Equity-based compensation expense			5,661
Adjustments to market - SECT, SERP and other			(43,704)
Net earnings	$ 9,205			9,205
Dividends (1)				(25,210)
Adoption of 606 | Accounting Standards Update 2014-09				0
Class A and B shares purchased					(233,101)
Issuance of shares						28,768	0
Purchase of shares - SECT	(6,774)					(6,774)
Adjustment to market						25,256	18,448
Other comprehensive income (loss)	130,024							130,024
End of year at Oct. 03, 2020	$ 1,243,083	51,280	472,645	2,112,734	(990,783)	(64,242)	(53,098)	(285,453)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Class B to Class A									4,294			(4,294)
End of year - Common stock at Oct. 03, 2020									43,799,229			7,480,484
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued related to equity awards										31,943			215,040
Shares purchased										(2,890,429)			(214,428)
Shares issued														408,641	0
Purchase of shares - SECT														(79,884)
End of year - Shares at Oct. 03, 2020										(13,959,998)	(425,148)		(3,344,877)	(557,543)	(826,170)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 0.75
Issuance of shares			7,478		14,139
Equity-based compensation expense			6,859
Adjustments to market - SECT, SERP and other			22,640
Net earnings	$ 157,220			157,220
Dividends (1)				(32,106)
Adoption of 606 | Accounting Standards Update 2014-09				0
Class A and B shares purchased					(30,862)
Issuance of shares						679	0
Purchase of shares - SECT	(4,239)					(4,239)
Adjustment to market						(11,974)	(10,666)
Other comprehensive income (loss)	37,893							37,893
End of year at Oct. 02, 2021	$ 1,400,144	$ 51,280	$ 509,622	$ 2,237,848	$ (1,007,506)	$ (79,776)	$ (63,764)	$ (247,560)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Class B to Class A									4,007			(4,007)
End of year - Common stock at Oct. 02, 2021									43,803,236			7,476,477
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued related to equity awards										39,227			346,585
Shares purchased										(236,950)			(180,763)
Shares issued														8,683	0
Purchase of shares - SECT														(52,020)
End of year - Shares at Oct. 02, 2021										(14,157,721)	(425,148)		(3,179,055)	(600,880)	(826,170)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 1.00