Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Income Statement [Abstract]
Net sales	$ 1,645,319	$ 1,250,274	$ 1,030,248
Cost of sales and distribution	1,298,846	994,871	805,612
Gross Profit	346,473	255,403	224,636
Selling and marketing expenses	89,875	77,843	70,979
General and administrative expenses	112,917	69,855	45,419
Restructuring charges, net	1,987	0	0
Operating Income	141,694	107,705	108,238
Interest expense (income), net	35,652	13,054	(521)
Other (income) expense	(4,846)	(109)	(166)
Income Before Income Taxes	110,888	94,760	108,925
Income tax expense	27,200	31,619	37,726
Net Income	$ 83,688	$ 63,141	$ 71,199
Earnings per share
Basic (usd per share)	$ 4.84	$ 3.80	$ 4.38
Diluted (usd per share)	$ 4.83	$ 3.77	$ 4.34