Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Income Statement [Abstract]
Total revenue	[1]	$ 2,008,028	$ 2,248,198	$ 6,328,954	$ 7,362,413
Cost of goods sold (exclusive of depreciation and amortization, shown separately below)	[1]	1,467,847	1,751,335	4,533,510	5,742,799
Operating expenses		414,448	377,330	1,210,884	1,130,554
Depreciation and amortization		65,185	63,285	195,299	185,981
Interest, net		11,469	13,209	35,510	39,613
Income before income taxes		49,079	43,039	353,751	263,466
Federal and state income taxes		10,452	9,080	82,549	61,711
Net income		$ 38,627	$ 33,959	$ 271,202	$ 201,755
Net income per common share
Basic (in dollars per share)		$ 1.04	$ 0.92	$ 7.33	$ 5.47
Diluted (in dollars per share)		$ 1.04	$ 0.91	$ 7.28	$ 5.43
Basic weighted average shares outstanding (in shares)		37,042,544	36,920,960	37,017,656	36,901,338
Plus effect of stock compensation (in shares)		241,047	221,917	240,962	221,187
Diluted weighted average shares outstanding (in shares)		37,283,591	37,142,877	37,258,618	37,122,525
Dividends declared per share (in dollars per share)		$ 0.34	$ 0.32	$ 0.98	$ 0.96
Excise taxes		$ 249,678	$ 270,023	$ 784,950	$ 833,750

[1] Includes excise taxes of: $249,678; $2270,023; $784,950; and $833,750