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Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended	3 Months Ended
	Dec. 16, 2020	Nov. 30, 2020	Nov. 28, 2020	Nov. 30, 2019
Components Of Shareholders Equity [Line Items]
Treasury stock reissued to fund plan, shares			15	16
Cash dividends paid per common share			$ 0.75	$ 0.75
Cash dividends paid			$ 41,815	$ 41,536
Regular Dividends [Member]
Components Of Shareholders Equity [Line Items]
Dividends declared date	Dec. 16, 2020
Dividends payable per share	$ 0.75
Dividend payable date	Jan. 26, 2021
Dividends record date	Jan. 12, 2021
Dividend payable amount	$ 41,861
Special Dividends [Member]
Components Of Shareholders Equity [Line Items]
Dividends payable per share		$ 3.50
Dividend payable date		Dec. 15, 2020
Dividends record date		Dec. 01, 2020
Dividend payable amount		$ 195,351
Class A Common Stock [Member]
Components Of Shareholders Equity [Line Items]
Common stock shares repurchased			46	41
Number of shares authorized for repurchase			1,157
Treasury Stock [Member] | Class A Common Stock [Member]
Components Of Shareholders Equity [Line Items]
Purchase of treasury stock			$ 3,159	$ 3,009

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