Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Income Statement [Abstract]
Total revenue	$ 3,262,942	$ 2,215,905	$ 6,444,935	$ 4,320,926
Cost of goods sold (exclusive of depreciation and amortization, shown separately below)	2,545,352	1,584,145	5,003,458	3,065,663
Operating expenses	500,644	410,348	979,572	796,436
Depreciation and amortization	74,258	64,294	150,146	130,114
Interest, net	13,520	10,634	27,250	24,041
Income before income taxes	129,168	146,484	284,509	304,672
Federal and state income taxes	32,337	34,501	68,519	72,097
Net income	$ 96,831	$ 111,983	$ 215,990	$ 232,575
Net income per common share
Basic (in dollars per share)	$ 2.61	$ 3.02	$ 5.81	$ 6.29
Diluted (in dollars per share)	$ 2.59	$ 3.00	$ 5.78	$ 6.24
Basic weighted average shares outstanding (in shares)	37,162,984	37,030,921	37,144,744	37,002,901
Plus effect of stock compensation (in shares)	205,669	245,962	205,669	245,749
Diluted weighted average shares outstanding (in shares)	37,368,653	37,276,883	37,350,413	37,248,650
Dividends declared per share (in dollars per share)	$ 0.35	$ 0.32	$ 0.69	$ 0.64