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]
Net sales	$ 431,954	$ 395,755	$ 1,270,624	$ 1,251,136
Cost of sales and distribution	356,134	323,407	1,025,155	997,219
Gross Profit	75,820	72,348	245,469	253,917
Selling and marketing expenses	21,862	21,401	63,368	62,539
General and administrative expenses	26,202	26,914	86,414	86,246
Restructuring charges, net	(847)	0	5,404	(207)
Operating Income	28,603	24,033	90,283	105,339
Interest expense, net	5,746	6,924	17,757	22,448
Other income, net	(259)	(165)	(2,928)	(699)
Income Before Income Taxes	23,116	17,274	75,454	83,590
Income tax expense	5,921	4,470	19,518	21,742
Net Income	$ 17,195	$ 12,804	$ 55,936	$ 61,848
Weighted Average Shares Outstanding
Basic (in shares)	16,994,975	16,922,231	16,974,701	16,902,255
Diluted (in shares)	17,047,211	16,974,956	17,036,586	16,947,449
Net earnings per share
Basic (in usd per share)	$ 1.01	$ 0.76	$ 3.30	$ 3.66
Diluted (in usd per share)	$ 1.01	$ 0.75	$ 3.28	$ 3.65