Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Income Statement [Abstract]
Total revenue	$ 3,048,717	$ 2,008,028	$ 9,493,652	$ 6,328,954
Cost of goods sold (exclusive of depreciation and amortization, shown separately below)	2,384,222	1,467,847	7,387,680	4,533,510
Operating expenses	490,997	414,448	1,470,569	1,210,884
Depreciation and amortization	75,529	65,185	225,675	195,299
Interest, net	14,431	11,469	41,681	35,510
Income before income taxes	83,538	49,079	368,047	353,751
Federal and state income taxes	19,514	10,452	88,033	82,549
Net income	$ 64,024	$ 38,627	$ 280,014	$ 271,202
Net income per common share
Basic (in dollars per share)	$ 1.72	$ 1.04	$ 7.54	$ 7.33
Diluted (in dollars per share)	$ 1.71	$ 1.04	$ 7.50	$ 7.28
Basic weighted average shares outstanding (in shares)	37,169,213	37,042,544	37,154,883	37,017,656
Plus effect of stock compensation (in shares)	197,370	241,047	197,370	240,962
Diluted weighted average shares outstanding (in shares)	37,366,583	37,283,591	37,352,253	37,258,618
Dividends declared per share (in dollars per share)	$ 0.35	$ 0.34	$ 1.04	$ 0.98