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Reconciliation of Weighted Average Shares Outstanding and Share Repurchases, Share Repurchases and Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 16, 2019 | Dec. 19, 2018 | Oct. 24, 2018 | Sep. 26, 2018 | Jul. 18, 2018 | Jun. 21, 2018 | Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2019 | Jan. 31, 2018
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Cash dividends | $ 18,900 |  | $ 18,900 |  | $ 19,000 |  |  |  | $ 56,963 | $ 55,093
Class A Common [Member] |  |  |  |  |  |  |  |  |  |
Share repurchases [Abstract] |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  |  | 208,711 | 0 | 633,831 | 550,757
Average purchase price (in dollars per share) |  |  |  |  |  |  | $ 47.91 | $ 0 | $ 55.21 | $ 53.12
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock (in dollars per share) |  |  |  |  |  |  | 0.33 | 0.32 | $ 0.99 | 0.96
Class A Common [Member] | Dividend Declared in Q1 2019 [Member] |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Jun. 21, 2018 |
Common stock (in dollars per share) |  |  |  |  |  | $ 0.33 |  |  |  |
Dividend payable date |  |  |  |  |  |  |  |  | Jul. 18, 2018 |
Dividend record date |  |  |  |  |  |  |  |  | Jul. 03, 2018 |
Class A Common [Member] | Dividend Declared in Q2 2019 [Member] |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Sep. 26, 2018 |
Common stock (in dollars per share) |  |  |  | $ 0.33 |  |  |  |  |  |
Dividend payable date |  |  |  |  |  |  |  |  | Oct. 24, 2018 |
Dividend record date |  |  |  |  |  |  |  |  | Oct. 09, 2018 |
Class A Common [Member] | Dividend Declared in Q3 2019 [Member] |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Dec. 19, 2018 |
Common stock (in dollars per share) |  | $ 0.33 |  |  |  |  |  |  |  |
Dividend payable date |  |  |  |  |  |  |  |  | Jan. 16, 2019 |
Dividend record date |  |  |  |  |  |  |  |  | Jan. 02, 2019 |
Class B Common [Member] |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock (in dollars per share) |  |  |  |  |  |  | $ 0.33 | $ 0.32 | $ 0.99 | $ 0.96
Class B Common [Member] | Dividend Declared in Q1 2019 [Member] |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Jun. 21, 2018 |
Common stock (in dollars per share) |  |  |  |  |  | $ 0.33 |  |  |  |
Dividend payable date |  |  |  |  |  |  |  |  | Jul. 18, 2018 |
Dividend record date |  |  |  |  |  |  |  |  | Jul. 03, 2018 |
Class B Common [Member] | Dividend Declared in Q2 2019 [Member] |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Sep. 26, 2018 |
Common stock (in dollars per share) |  |  |  | $ 0.33 |  |  |  |  |  |
Dividend payable date |  |  |  |  |  |  |  |  | Oct. 24, 2018 |
Dividend record date |  |  |  |  |  |  |  |  | Oct. 09, 2018 |
Class B Common [Member] | Dividend Declared in Q3 2019 [Member] |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Dec. 19, 2018 |
Common stock (in dollars per share) |  | $ 0.33 |  |  |  |  |  |  |  |
Dividend payable date |  |  |  |  |  |  |  |  | Jan. 16, 2019 |
Dividend record date |  |  |  |  |  |  |  |  | Jan. 02, 2019 |

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