Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 14,728	$ (49,257)	$ 63,582	$ (44,246)
Other comprehensive income, net of tax:
Change in pension benefits, net of deferred taxes of $18,230 and $18,481, for the three and nine months ended January 31, 2022, respectively	0	53,822	0	54,568
Change in Cash flow hedges (swap), net of deferred taxes (benefit) of $(890) and $763, and $461 and $1,404 for the three and nine months ended January 31, 2023 and 2022, respectively	(2,627)	2,253	1,360	4,145
Total Comprehensive Income	$ 12,101	$ 6,818	$ 64,942	$ 14,467