Leases - Components of Lease Expense (Detail) - USD ($)	3 Months Ended
	Jul. 31, 2024	Jul. 31, 2023
Finance lease cost
Amortization of ROU assets	$ 379,000	$ 402,000
Interest on lease liabilities	49,000	54,000
Finance lease cost	428,000	456,000
Operating lease cost	11,995,000	11,697,000
Short-term lease cost	226,000	269,000
Variable lease cost	2,341,000	3,191,000
Lease impairment cost	0	1,629,000
Sublease income	(1,153,000)	(1,063,000)
Total lease cost	$ 13,837,000	$ 16,179,000