Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022
Deferred income tax assets:
Allowances on accounts and notes receivable	$ 5,339	$ 4,314
Accrued payroll and related costs	2,102	3,758
Insurance reserves	4,165	4,079
Inventory costs	5,580	4,606
Deferred compensation	10,391	9,038
Equity compensation	3,716	3,253
Derivative instrument	0	281
Acquisition related costs	1,258	1,356
Net operating loss carry-forwards	1,368	1,815
Disallowed interest expense	1,854	1,330
Investment in partnerships	28,324	26,700
Operating lease liability	47,256	37,746
Other deferred tax assets, net	2,613	2,359
Total deferred income tax assets	113,966	100,635
Less: Valuation allowance	(11,708)	(11,719)
Total deferred income tax assets, net of valuation allowance	102,258	88,916
Deferred income tax liabilities:
Amortization of intangible assets	(40,191)	(43,314)
Operating lease right-of-use assets	(45,966)	(37,043)
Depreciation	(46,715)	(37,027)
Other deferred tax liabilities, net	(770)	(451)
Total deferred income tax liabilities	(133,642)	(117,835)
Deferred income tax liabilities	$ (31,384)	$ (28,919)