Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jul. 31, 2017	Jan. 31, 2019	Jan. 31, 2018
Income Statement [Abstract]
Net sales	$ 384,080	$ 292,791		$ 1,237,920	$ 844,387
Cost of sales and distribution	307,227	242,412		978,569	678,179
Gross Profit	76,853	50,379		259,351	166,208
Selling and marketing expenses	22,215		$ 19,167	68,139	55,397
General and administrative expenses	27,462	23,492		86,010	41,442
Restructuring charges, net	26			2,061	0
Operating Income	27,150		7,720	103,141	69,369
Interest expense, net	8,836	4,035		27,204	2,887
Other income, net	(5,812)		(79)	(6,137)	(117)
Income Before Income Taxes	24,126	3,764		82,074	66,599
Income tax expense	5,717	1,768		20,410	22,567
Net Income	$ 18,409	$ 1,996	$ 22,281	$ 61,664	$ 44,032
Weighted Average Shares Outstanding
Basic (in shares)	17,186,456	16,578,235		17,425,385	16,349,716
Diluted (in shares)	17,216,327	16,690,760		17,466,936	16,461,509
Net earnings per share
Basic (in usd per share)	$ 1.07	$ 0.12		$ 3.54	$ 2.69
Diluted (in usd per share)	$ 1.07	$ 0.12		$ 3.53	$ 2.67