Segments - Reconciliation of Net Income to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Jan. 31, 2022	Oct. 31, 2021	Jul. 31, 2021	Jan. 31, 2021	Oct. 31, 2020	Jul. 31, 2020	Jan. 31, 2022	Jan. 31, 2021
Segment Reporting [Abstract]
Net income	$ 61,383	$ 74,361	$ 61,202	$ 16,126	$ 28,469	$ 27,219	$ 196,946	$ 71,814
Interest expense	15,429			13,454			43,830	41,060
Interest income	(40)			(6)			(67)	(57)
Provision for income taxes	21,211			5,709			64,951	23,590
Depreciation expense	13,816			11,371			40,444	36,908
Amortization expense	15,934			14,191			46,423	42,996
Stock appreciation rights	1,251			1,446			3,126	2,552
Redeemable noncontrolling interests	182			624			1,085	1,062
Equity-based compensation	3,077			1,877			8,250	6,734
Severance and other permitted costs	273			(83)			669	2,626
Transaction costs (acquisitions and other)	921			664			3,889	789
Gain on disposal of assets	(252)			(1,404)			(474)	(529)
Effects of fair value adjustments to inventory	1,870			0			3,601	0
Gain on legal settlement	0			(1,382)			0	(1,382)
Adjusted EBITDA	$ 135,055			$ 62,587			$ 412,673	$ 228,163