Earnings (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Jan. 31, 2025	Oct. 31, 2024	Jul. 31, 2024	Jan. 31, 2024	Oct. 31, 2023	Jul. 31, 2023	Jan. 31, 2025	Jan. 31, 2024
Computation of basic and diluted earnings per share of common stock
Net income (loss)	$ (21,409)	$ 53,536	$ 57,248	$ 51,905	$ 80,957	$ 86,830	$ 89,375	$ 219,692
Basic earnings (loss) per common share:
Basic weighted average common shares outstanding (in shares)	38,708			39,864			39,125	40,360
Basic earnings (loss) per common share (in dollars per share)	$ (0.55)			$ 1.30			$ 2.28	$ 5.44
Diluted earnings (loss) per common share:
Basic weighted average common shares outstanding (in shares)	38,708			39,864			39,125	40,360
Add: Common Stock Equivalents (in shares)	0			648			602	666
Diluted weighted average common shares outstanding (in shares)	38,708			40,512			39,727	41,026
Diluted earnings (loss) per common share (in dollars per share)	$ (0.55)			$ 1.28			$ 2.25	$ 5.35
Shares were not included in the calculation of Diluted loss per common share
Anti-dilutive shares (in shares)	500			0			0	0