Leases - Components of Lease Costs (Details) - USD ($)	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Lease, Cost [Abstract]
Reduction in the carrying value of right-of-use assets	$ 2,078,000	$ 1,720,000	$ 1,404,000
Interest on lease liabilities	202,000	105,000	106,000
Operating lease cost	31,365,000	26,592,000	27,610,000
Operating cash flows for finance leases	202,000	105,000	106,000
Operating cash flows for operating leases	30,388,000	26,906,000	25,100,000
Financing cash flows for financing leases	2,059,000	1,714,000	1,379,000
Right-of-use assets obtained in exchange for new finance lease liabilities	4,738	1,138	1,862
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 26,912	$ 11,109	$ 7,482
Weighted average remaining lease term - finance leases	2 years 8 months 15 days	1 year 11 months 26 days	2 years 3 months 25 days
Weighted average remaining lease term - operating leases	5 years 10 months 28 days	4 years 10 months 2 days	5 years 9 months 7 days
Weighted average discount rate - finance leases (percent)	6.04%	3.69%	2.91%
Weighted average discount rate - operating leases (percent)	4.18%	3.35%	3.20%