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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations resulting from statutory tax rate increase (decrease).

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Percentage of foreign statutory tax rate applicable to pretax income (loss).

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Date the declared dividend will be paid, in YYYY-MM-DD format.

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Date the dividend to be paid was declared, in YYYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in YYYY-MM-DD format.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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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