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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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Date the declared dividend will be paid, in YYYY-MM-DD format.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
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- Definition

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

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- Definition

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

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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Capital Stock and Changes in Capital Accounts, Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended
	Apr. 20, 2022	Jan. 12, 2022	Oct. 27, 2021	Jul. 21, 2021	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Cash dividend [Abstract]
Total dividend					$ 77,205	$ 76,938	$ 76,658
Class A [Member]
Cash dividend [Abstract]
Common stock dividend (in dollars per share)					$ 1.38	$ 1.37	$ 1.36
Class A [Member] \| Dividend Declared in Q1 2021 [Member]
Cash dividend [Abstract]
Date of declaration by board of directors					Jun. 22, 2021
Common stock dividend (in dollars per share)					$ 0.3450
Total dividend				$ 19,300
Dividend paid date					Jul. 21, 2021
Dividend record date					Jul. 06, 2021
Class A [Member] \| Dividend Declared in Q2 2021 [Member]
Cash dividend [Abstract]
Date of declaration by board of directors					Sep. 29, 2021
Common stock dividend (in dollars per share)					$ 0.3450
Total dividend			$ 19,200
Dividend paid date					Oct. 27, 2021
Dividend record date					Oct. 12, 2021
Class A [Member] \| Dividend Declared in Q3 2021 [Member]
Cash dividend [Abstract]
Date of declaration by board of directors					Dec. 15, 2021
Common stock dividend (in dollars per share)					$ 0.3450
Total dividend		$ 19,200
Dividend paid date					Jan. 12, 2022
Dividend record date					Dec. 28, 2021
Class A [Member] \| Dividend Declared in Q4 2021 [Member]
Cash dividend [Abstract]
Date of declaration by board of directors					Mar. 23, 2022
Common stock dividend (in dollars per share)					$ 0.3450
Total dividend	$ 19,200
Dividend paid date					Apr. 20, 2022
Dividend record date					Apr. 05, 2022
Class B [Member]
Cash dividend [Abstract]
Common stock dividend (in dollars per share)					$ 1.38	$ 1.37	$ 1.36
Class B [Member] \| Dividend Declared in Q1 2021 [Member]
Cash dividend [Abstract]
Date of declaration by board of directors					Jun. 22, 2021
Common stock dividend (in dollars per share)					$ 0.3450
Total dividend				$ 19,300
Dividend paid date					Jul. 21, 2021
Dividend record date					Jul. 06, 2021
Class B [Member] \| Dividend Declared in Q2 2021 [Member]
Cash dividend [Abstract]
Date of declaration by board of directors					Sep. 29, 2021
Common stock dividend (in dollars per share)					$ 0.3450
Total dividend			$ 19,200
Dividend paid date					Oct. 27, 2021
Dividend record date					Oct. 12, 2021
Class B [Member] \| Dividend Declared in Q3 2021 [Member]
Cash dividend [Abstract]
Date of declaration by board of directors					Dec. 15, 2021
Common stock dividend (in dollars per share)					$ 0.3450
Total dividend		$ 19,200
Dividend paid date					Jan. 12, 2022
Dividend record date					Dec. 28, 2021
Class B [Member] \| Dividend Declared in Q4 2021 [Member]
Cash dividend [Abstract]
Date of declaration by board of directors					Mar. 23, 2022
Common stock dividend (in dollars per share)					$ 0.3450
Total dividend	$ 19,200
Dividend paid date					Apr. 20, 2022
Dividend record date					Apr. 05, 2022