Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Condensed Consolidated Statements of Operations and Comprehensive Income (Loss)
Net sales	$ 591,846	$ 458,077	$ 1,141,646	$ 910,518
Cost of sales (exclusive of depreciation and amortization shown separately below)	398,622	314,164	769,837	625,717
Gross profit	193,224	143,913	371,809	284,801
Operating expenses:
Selling, general and administrative	149,798	114,352	284,856	224,562
Depreciation and amortization	17,368	15,262	33,163	31,327
Total operating expenses	167,166	129,614	318,019	255,889
Operating income	26,058	14,299	53,790	28,912
Other (expense) income:
Interest expense	(7,154)	(9,260)	(14,731)	(18,517)
Write-off of debt discount and deferred financing fees	(1,466)		(6,892)
Other income, net	496	409	1,089	919
Total other (expense), net	(8,124)	(8,851)	(20,534)	(17,598)
Income before taxes	17,934	5,448	33,256	11,314
Provision for income taxes	710	2,623	6,869	5,478
Net income	$ 17,224	$ 2,825	$ 26,387	$ 5,836
Weighted average shares outstanding:
Basic (in shares)	40,942,905	32,737,956	39,579,244	32,707,297
Diluted (in shares)	41,319,651	32,898,075	39,955,990	32,915,871
Net income per share:
Basic (in dollars per share)	$ 0.42	$ 0.09	$ 0.67	$ 0.18
Diluted (in dollars per share)	$ 0.42	$ 0.09	$ 0.66	$ 0.18
Comprehensive loss:
Net income	$ 17,224	$ 2,825	$ 26,387	$ 5,836
Increase (decrease) in fair value of financial instrument, net of tax	100	(524)	12	(705)
Comprehensive income	$ 17,324	$ 2,301	$ 26,399	$ 5,131