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Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Feb. 29, 2020 | Mar. 02, 2019 | Feb. 29, 2020 | Mar. 02, 2019
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Treasury stock reissued to fund plan, shares |  | 19 | 20 | 35 | 33
Cash dividends paid per common share |  |  |  |  | $ 1.26
Cash dividends paid |  |  |  | $ 360,815 | $ 69,551
Subsequent Event [Member] |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Dividends payable per share | $ 0.75 |  |  |  |
Dividend payable date | Apr. 28, 2020 |  |  |  |
Dividends record date | Apr. 14, 2020 |  |  |  |
Dividend payable amount | $ 41,668 |  |  |  |
Regular Dividends [Member] |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Cash dividends paid per common share |  |  |  | $ 1.50 |
Cash dividends paid |  |  |  | $ 83,181 |
Special Dividends [Member] |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Cash dividends paid per common share |  |  |  | $ 5.00 |
Cash dividends paid |  |  |  | $ 277,634 |
Class A Common Stock [Member] |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Common stock shares repurchased |  | 3 | 275 | 44 | 315
Treasury stock repurchased, and treasury stock repurchased and retired, shares |  |  | 275 |  | 1,053
Treasury stock repurchased, and treasury stock repurchased and retired, amount |  |  | $ 20,898 |  | $ 84,425
Number of shares authorized for repurchase |  | 1,157 |  | 1,157 |
Treasury Stock [Member] | Class A Common Stock [Member] |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Purchase of treasury stock |  | $ 199 | $ 20,898 | $ 3,208 | $ 24,098

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