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Segment Information, Reconciliation of Consolidated US GAAP Operating Income to Non-GAAP Adjusted Contribution to Profit (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Reconciliation of Consolidated US GAAP Operating Income to Non-GAAP Adjusted Contribution to Profit [Abstract]
US GAAP Operating Income		$ 73,888	$ 69,905	$ 114,856	$ 99,944
Adjustments [Abstract]
Restructuring and related (credits) charges	[1]	(1,333)	1,920	(1,609)	4,138
Non-GAAP Adjusted Contribution to Profit		$ 72,555	$ 71,825	$ 113,247	$ 104,082
[1] See Note 9, “Restructuring and Related (Credits) Charges” for these charges by segment.

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