Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 2,981	$ 16,059
Other comprehensive income, net of tax:
Change in pension benefits, net of deferred taxes of $126 and $113 for the three months ended July 31, 2021 and 2020, respectively	373	327
Change in cash flow hedges (swap), net of deferred taxes of $(194) for the three months ended July 31, 2021	(573)	0
Total Comprehensive Income	$ 2,781	$ 16,386