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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 15, 2022 | Feb. 26, 2022 | Feb. 27, 2021 | Feb. 26, 2022 | Feb. 27, 2021
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Ownership Plan |  | 16,000 | 16,000 | 30,000 | 31,000
Cash dividends paid per common share |  |  |  | $ 1.50 | $ 1.50
Cash dividends paid |  |  |  | $ 83,586 | $ 83,685
Special Cash Dividend [Member] |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Cash dividends paid per common share |  |  |  |  | $ 3.50
Cash dividends paid |  |  |  |  | $ 195,351
Subsequent Event [Member] |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Dividends declared date | Mar. 22, 2022 |  |  |  |
Dividends payable per share | $ 0.75 |  |  |  |
Dividend payable date | Apr. 26, 2022 |  |  |  |
Dividends date of record | Apr. 12, 2022 |  |  |  |
Dividend payable amount | $ 41,881 |  |  |  |
Class A Common Stock [Member] |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Common stock shares repurchased |  | 4,000 | 4,000 | 57,000 | 50,000
Purchase of treasury stock |  | $ 254 | $ 360 | $ 4,813 | $ 3,519
Class A Common Stock [Member] | Share Repurchase Program [Member] |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Number of shares authorized for repurchase |  | 5,000 |  | 5,000 |
Maximum number of shares that can be repurchased |  | 5,000 |  | 5,000 |
Treasury Stock [Member] | Class A Common Stock [Member] |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Purchase of treasury stock |  | $ 254 | $ 360 | $ 4,813 | $ 3,519

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