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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
		Jul. 31, 2021	Jul. 31, 2020
Reconciliation of Consolidated US GAAP Operating Income to Non-GAAP Adjusted Contribution to Profit [Abstract]
US GAAP Operating Income		$ 40,968	$ 30,039
Adjustments [Abstract]
Restructuring and related (credits) charges	[1]	(276)	2,218
Non-GAAP Adjusted Contribution to Profit		$ 40,692	$ 32,257
[1] See Note 9, “Restructuring and Related (Credits) Charges” for these charges by segment.

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Restructuring charges for research and professional development, net of related reversal of severance provisions previously recorded by the Company.

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The net result for the period of deducting operating expenses from operating revenues.

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