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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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