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]
Net sales	$ 448,583	$ 428,016	$ 838,670	$ 855,381
Cost of sales and distribution	359,072	340,966	669,021	673,812
Gross Profit	89,511	87,050	169,649	181,569
Selling and marketing expenses	21,608	20,451	41,506	41,138
General and administrative expenses	30,229	29,900	60,212	59,332
Restructuring charges, net	2,791	(188)	6,251	(207)
Operating Income	34,883	36,887	61,680	81,306
Interest expense, net	5,981	7,436	12,011	15,524
Other income, net	(981)	(527)	(2,669)	(534)
Income Before Income Taxes	29,883	29,978	52,338	66,316
Income tax expense	7,627	7,815	13,597	17,272
Net Income	$ 22,256	$ 22,163	$ 38,741	$ 49,044
Weighted Average Shares Outstanding
Basic (in shares)	16,992,297	16,919,664	16,964,565	16,892,267
Diluted (in shares)	17,047,296	16,955,835	17,036,652	16,932,236
Net earnings per share
Basic (in usd per share)	$ 1.31	$ 1.31	$ 2.28	$ 2.90
Diluted (in usd per share)	$ 1.31	$ 1.31	$ 2.27	$ 2.90