Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Stock Repurchases (Details) - Class A Common Shares - USD ($) $ in Millions	9 Months Ended	245 Months Ended
	Jan. 31, 2023	Jan. 31, 2023	Aug. 19, 2002
Equity, Class of Treasury Stock [Line Items]
Common stock shares repurchased (in shares)	4,588,632
Cost of common stock repurchased	$ 25.6
Shares Stock Repurchase Plan, August 19, 2002
Equity, Class of Treasury Stock [Line Items]
Approved number of shares to be repurchased (in shares)			2,000,000
Common stock shares repurchased (in shares)		1,053,679
Cost of common stock repurchased		$ 6.2