Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Income Statement [Abstract]
Net sales	$ 395,755	$ 384,080	$ 1,251,136	$ 1,237,920
Cost of sales and distribution	323,407	307,227	997,219	978,569
Gross Profit	72,348	76,853	253,917	259,351
Selling and marketing expenses	21,401	22,215	62,539	68,139
General and administrative expenses	26,914	27,462	86,246	86,010
Restructuring charges, net	0	26	(207)	2,061
Operating Income	24,033	27,150	105,339	103,141
Interest expense, net	6,924	8,836	22,448	27,204
Other (income) expense, net	(165)	(5,812)	(699)	(6,137)
Income Before Income Taxes	17,274	24,126	83,590	82,074
Income tax expense	4,470	5,717	21,742	20,410
Net Income	$ 12,804	$ 18,409	$ 61,848	$ 61,664
Weighted Average Shares Outstanding
Basic (in shares)	16,922,231	17,186,456	16,902,255	17,425,385
Diluted (in shares)	16,974,956	17,216,327	16,947,449	17,466,936
Net earnings per share
Basic (in usd per share)	$ 0.76	$ 1.07	$ 3.66	$ 3.54
Diluted (in usd per share)	$ 0.75	$ 1.07	$ 3.65	$ 3.53