Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Income Statement [Abstract]
Total revenue	[1]	$ 2,215,905	$ 2,487,586	$ 4,320,926	$ 5,114,215
Cost of goods sold (exclusive of depreciation and amortization, shown separately below)	[1]	1,584,145	1,930,521	3,065,663	3,991,464
Operating expenses		410,348	373,383	796,436	753,224
Depreciation and amortization		64,294	62,888	130,114	122,696
Interest, net		10,634	12,683	24,041	26,404
Income before income taxes		146,484	108,111	304,672	220,427
Federal and state income taxes		34,501	26,130	72,097	52,631
Net income		$ 111,983	$ 81,981	$ 232,575	$ 167,796
Net income per common share
Basic (in dollars per share)		$ 3.02	$ 2.22	$ 6.29	$ 4.55
Diluted (in dollars per share)		$ 3.00	$ 2.21	$ 6.24	$ 4.52
Basic weighted average shares outstanding (in shares)		37,030,921	36,916,937	37,002,901	36,891,324
Plus effect of stock compensation (in shares)		245,962	219,248	245,749	218,189
Diluted weighted average shares outstanding (in shares)		37,276,883	37,136,185	37,248,650	37,109,513
Dividends declared per share (in dollars per share)		$ 0.32	$ 0.32	$ 0.64	$ 0.64
Excise taxes		$ 275,733	$ 289,109	$ 535,272	$ 563,726

[1] Includes excise taxes of: $275,733; $289,109; $535,272; and $563,726