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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 25, 2021 | Jun. 10, 2021 | Jul. 31, 2021 | Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Cash Dividends [Abstract] |  |  |  |  |  |
Total Dividend |  |  |  | $ 76,938 | $ 76,658 | $ 75,752
UK [Member] | Forecast [Member] |  |  |  |  |  |
UK Corporate Tax Rate [Abstract] |  |  |  |  |  |
Noncash US GAAP deferred tax expense |  |  | $ 20,000 |  |  |
Class A Common Stock [Member] |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |
Common stock dividend (in dollars per share) |  |  |  | $ 1.37 | $ 1.36 | $ 1.32
Class B Common [Member] |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |
Common stock dividend (in dollars per share) |  |  |  | $ 1.37 | $ 1.36 | $ 1.32
Subsequent Event [Member] | UK [Member] |  |  |  |  |  |
UK Corporate Tax Rate [Abstract] |  |  |  |  |  |
Foreign statutory tax rate |  | 19.00% |  |  |  |
Foreign statutory tax rate effective April 2023 |  | 25.00% |  |  |  |
Subsequent Event [Member] | Dividend Declared in Q1 2022 [Member] |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |
Total Dividend | $ 19,300 |  |  |  |  |
Subsequent Event [Member] | Class A Common Stock [Member] | Dividend Declared in Q1 2022 [Member] |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |
Dividend declared date | Jun. 22, 2021 |  |  |  |  |
Common stock dividend (in dollars per share) | $ 0.3450 |  |  |  |  |
Dividend payable date | Jul. 21, 2021 |  |  |  |  |
Dividend record date | Jul. 06, 2021 |  |  |  |  |
Subsequent Event [Member] | Class B Common [Member] | Dividend Declared in Q1 2022 [Member] |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |
Dividend declared date | Jun. 22, 2021 |  |  |  |  |
Common stock dividend (in dollars per share) | $ 0.3450 |  |  |  |  |
Dividend payable date | Jul. 21, 2021 |  |  |  |  |
Dividend record date | Jul. 06, 2021 |  |  |  |  |

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