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Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 30, 2021	Feb. 27, 2021	Feb. 29, 2020	Feb. 27, 2021	Feb. 29, 2020
Components Of Shareholders Equity [Line Items]
Treasury stock reissued to fund plan, shares		16	19	31	35
Cash dividends paid per common share				$ 5.00
Cash dividends paid				$ 279,036
Regular Dividends [Member]
Components Of Shareholders Equity [Line Items]
Cash dividends paid per common share				$ 1.50	$ 1.50
Cash dividends paid				$ 83,685	$ 83,181
Dividends declared date	Mar. 30, 2021
Dividends payable per share	$ 0.75
Dividend payable date	Apr. 27, 2021
Dividends record date	Apr. 13, 2021
Dividend payable amount	$ 41,963
Special Dividends [Member]
Components Of Shareholders Equity [Line Items]
Cash dividends paid per common share				$ 3.50	$ 5.00
Cash dividends paid				$ 195,351	$ 277,634
Class A Common Stock [Member]
Components Of Shareholders Equity [Line Items]
Common stock shares repurchased		4		50
Treasury Stock [Member]
Components Of Shareholders Equity [Line Items]
Maximum number of shares that can be repurchased		1,157		1,157
Treasury Stock [Member] | Class A Common Stock [Member]
Components Of Shareholders Equity [Line Items]
Purchase of treasury stock		$ 360	$ 199	$ 3,519	$ 3,208

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