Leases - Components of Lease Expense (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Finance lease cost
Amortization of ROU assets	$ 362,000	$ 448,000	$ 741,000	$ 850,000
Interest on lease liabilities	45,000	54,000	94,000	108,000
Finance lease cost	407,000	502,000	835,000	958,000
Operating lease cost	12,096,000	11,389,000	24,091,000	23,086,000
Short-term lease cost	202,000	222,000	428,000	491,000
Variable lease cost	3,027,000	3,724,000	5,368,000	6,915,000
Lease impairment cost	0	0	0	1,629,000
Sublease income	(1,206,000)	(1,051,000)	(2,359,000)	(2,114,000)
Total lease cost	$ 14,526,000	$ 14,786,000	$ 28,363,000	$ 30,965,000