Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Income Statement [Abstract]
Net sales	$ 428,016	$ 424,878	$ 855,381	$ 853,840
Cost of sales and distribution	340,966	338,116	673,812	671,342
Gross Profit	87,050	86,762	181,569	182,498
Selling and marketing expenses	20,451	22,986	41,138	45,924
General and administrative expenses	29,900	28,718	59,332	58,548
Restructuring charges, net	(188)	(406)	(207)	2,035
Operating Income	36,887	35,464	81,306	75,991
Interest expense, net	7,436	8,943	15,524	18,368
Other (income) expense, net	(527)	1,112	(534)	(325)
Income Before Income Taxes	29,978	25,409	66,316	57,948
Income tax expense	7,815	6,921	17,272	14,693
Net Income	$ 22,163	$ 18,488	$ 49,044	$ 43,255
Weighted Average Shares Outstanding
Basic (in shares)	16,919,664	17,555,584	16,892,267	17,544,849
Diluted (in shares)	16,955,835	17,588,449	16,932,236	17,589,767
Net earnings per share
Basic (in usd per share)	$ 1.31	$ 1.05	$ 2.90	$ 2.47
Diluted (in usd per share)	$ 1.31	$ 1.05	$ 2.90	$ 2.46