Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Change In Pension Benefits And Derivative Hedging Activities [Line Items]
Change in cash flow hedges (swap), net of deferred taxes of $641 for the three and six months ended October 31, 2021, respectively	$ 2,465	$ 0	$ 1,892	$ 0
Other comprehensive income, deferred tax	125	$ 111	251	$ 224
Cash Flow Hedging
Change In Pension Benefits And Derivative Hedging Activities [Line Items]
Other comprehensive income, deferred tax	$ 641		$ 641