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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | May 30, 2020 | Jun. 01, 2019 | May 30, 2020 | Jun. 01, 2019
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Treasury stock reissued to fund plan, shares |  | 20,000 | 14,000 | 55,000 | 47,000
Subsequent Event [Member] |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Dividends payable per share | $ 0.75 |  |  |  |
Dividend payable date | Jul. 28, 2020 |  |  |  |
Dividends record date | Jul. 14, 2020 |  |  |  |
Dividend payable amount | $ 41,685 |  |  |  |
Class A Common Stock [Member] |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Common stock shares repurchased |  | 500 | 500 | 44,000 | 316,000
Treasury stock repurchased, and treasury stock repurchased and retired, shares |  |  |  |  | 1,054,000
Treasury stock repurchased, and treasury stock repurchased and retired, amount |  |  | $ 39 |  | $ 84,464
Number of shares authorized for repurchase |  | 1,157,000 |  | 1,157,000 |
Treasury Stock [Member] | Class A Common Stock [Member] |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |
Purchase of treasury stock |  | $ 28 | $ 39 | $ 3,236 | $ 24,137

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