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Capital Stock and Changes in Capital Accounts - Share Repurchases (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Class A common stock
Equity, Class of Treasury Stock [Line Items]
Shares repurchased during period (in shares)	170	183	382	312
Treasury stock acquired (in dollars per share)	$ 44.24	$ 54.54	$ 45.84	$ 55.51
Class B common stock
Equity, Class of Treasury Stock [Line Items]
Shares repurchased during period (in shares)	0	0	0	1
Treasury stock acquired (in dollars per share)	$ 44.24	$ 54.54	$ 45.84	$ 55.51

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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