Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Change In Pension Benefits And Derivative Hedging Activities [Line Items]
Change in cash flow hedges (swap), net of deferred taxes of $763 and $1,404 for the three and nine months ended January 31, 2022, respectively	$ 2,253	$ 0	$ 4,145	$ 0
Other comprehensive income, deferred tax	18,230	$ 111	18,481	$ 338
Cash Flow Hedging
Change In Pension Benefits And Derivative Hedging Activities [Line Items]
Other comprehensive income, deferred tax	$ 763		$ 1,404