Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Income Statement [Abstract]
Net sales	$ 292,791	$ 249,285	$ 844,387	$ 771,511
Cost of sales and distribution	242,412	197,689	678,179	604,446
Gross Profit	50,379	51,596	166,208	167,065
Selling and marketing expenses	19,167	18,519	55,397	52,128
General and administrative expenses	23,492	11,476	41,442	33,083
Operating Income	7,720	21,601	69,369	81,854
Interest expense	4,498	447	4,603	776
Other income	(542)	(619)	(1,833)	(1,085)
Income Before Income Taxes	3,764	21,773	66,599	82,163
Income tax expense	1,768	7,220	22,567	28,312
Net Income	$ 1,996	$ 14,553	$ 44,032	$ 53,851
Weighted Average Shares Outstanding
Basic (in shares)	16,578,235	16,241,670	16,349,716	16,267,333
Diluted (in shares)	16,690,760	16,381,223	16,461,509	16,400,842
Net earnings per share
Basic (in usd per share)	$ 0.12	$ 0.90	$ 2.69	$ 3.31
Diluted (in usd per share)	$ 0.12	$ 0.89	$ 2.67	$ 3.28