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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 20, 2020 | Nov. 30, 2018 | Oct. 31, 2018 | Sep. 30, 2018 | Aug. 29, 2020 | Aug. 31, 2019 | Sep. 01, 2018
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Repurchase and retirement of common stock, Shares |  |  |  |  |  | 8,212,000 |
Repurchase and retirement of common stock, Value |  |  |  |  |  | $ 493,612 |
Purchase of treasury stock |  |  |  |  |  | $ 84,611 |
Shares repurchased |  |  |  |  |  | 44,000 |
Preferred stock, shares authorized |  |  |  |  | 5,000,000 | 5,000,000 |
Preferred stock, shares issued |  |  |  |  | 0 | 0 |
Preferred stock, shares outstanding |  |  |  |  | 0 | 0 |
Subsequent Event [Member] |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Dividends declared date | Oct. 20, 2020 |  |  |  |  |  |
Dividends payable per share | $ 0.75 |  |  |  |  |  |
Dividend payable date | Nov. 24, 2020 |  |  |  |  |  |
Dividends record date | Nov. 10, 2020 |  |  |  |  |  |
Dividend payable amount | $ 41,706 |  |  |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Repurchase and retirement of common stock, Shares |  | 123,000 | 2,000 | 113,000 |  |  |
Cost of repurchase, per share |  | $ 81.22 | $ 85.00 | $ 84.29 |  |  |
Common stock, votes per share |  |  |  |  | one |  |
Class B Common Stock [Member] |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Common stock, votes per share |  |  |  |  | 10 |  |
Treasury Stock [Member] |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Common stock shares repurchased |  |  |  |  |  | 1,055,000 |
Treasury stock repurchased, and treasury stock repurchased and retired, shares |  |  |  |  | 48,000 |  |
Treasury stock repurchased, and treasury stock repurchased and retired, amount |  |  |  |  | $ 3,444 |  |
Number of shares authorized for repurchase |  |  |  |  | 5,000,000 |  |
Maximum number of shares that can be repurchased |  |  |  |  | 1,157,000 |  |
Treasury stock reissued to fund plan, shares |  |  |  |  | 69,000 | 64,000 |
Treasury Stock [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  | $ 3,444 | $ 24,284 | $ 25,432

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