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Capital Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 05, 2019 | Sep. 11, 2019 | Jun. 12, 2019 | Mar. 13, 2019 | Aug. 31, 2019 | Apr. 30, 2019 | Feb. 28, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Payment of cash dividends |  |  |  |  |  |  |  |  |  | $ 61,636 | $ 60,395
Repurchases of Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |
Class A common stock repurchased |  |  |  |  |  |  |  | $ 0 | $ 12,399 | 825 | $ 48,222
Amount available for repurchases |  |  |  |  |  |  |  | $ 470,200 |  | $ 470,200 |
Treasury Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |
Class A common stock repurchased (in shares) |  |  |  |  |  |  |  | 0 | 200,000 | 14,000 | 600,000
Class A common stock repurchased |  |  |  |  |  |  |  | $ 0 | $ 12,399 | $ 825 | $ 48,222
Dividend Declared 2019 Q1 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  |  |  |  |  | 2019-02 |  | 2019-02 |
Dividend payable per share (in dollars per share) |  |  |  |  |  |  | $ 0.37 |  |  |  |
Payment of cash dividends |  |  |  | $ 20,500 |  |  |  |  |  |  |
Dividend payable, date paid |  |  |  |  |  |  |  |  |  | Mar. 13, 2019 |
Dividend payable, date of record |  |  |  |  |  |  |  |  |  | Feb. 25, 2019 |
Dividend Declared 2019 Q2 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  |  |  |  |  | 2019-04 |  | 2019-04 |
Dividend payable per share (in dollars per share) |  |  |  |  |  | $ 0.37 |  |  |  |  |
Payment of cash dividends |  |  | $ 20,600 |  |  |  |  |  |  |  |
Dividend payable, date paid |  |  |  |  |  |  |  |  |  | Jun. 12, 2019 |
Dividend payable, date of record |  |  |  |  |  |  |  |  |  | May 31, 2019 |
Dividend Declared 2019 Q3 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  |  |  |  |  | 2019-08 |  | 2019-08 |
Dividend payable per share (in dollars per share) |  |  |  |  | $ 0.37 |  |  |  |  |  |
Payment of cash dividends |  | $ 20,600 |  |  |  |  |  |  |  |  |
Dividend payable, date paid |  |  |  |  |  |  |  |  |  | Sep. 11, 2019 |
Dividend payable, date of record |  |  |  |  |  |  |  |  |  | Aug. 30, 2019 |
Dividend Declared 2019 Q4 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend payable, date declared | 2019-10 |  |  |  |  |  |  |  |  |  |
Dividend payable per share (in dollars per share) | $ 0.37 |  |  |  |  |  |  |  |  |  |
Dividend payable, date paid | Dec. 11, 2019 |  |  |  |  |  |  |  |  |  |
Dividend payable, date of record | Nov. 29, 2019 |  |  |  |  |  |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Net Income per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive shares excluded from calculation of diluted earnings per share (in shares) |  |  |  |  |  |  |  | 1,300,000 | 500,000 | 1,200,000 | 900,000

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