Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Condensed Consolidated Statements of Operations and Comprehensive Income
Net sales	$ 648,004	$ 591,846	$ 1,290,161	$ 1,141,646
Cost of sales (exclusive of depreciation and amortization shown separately below)	435,744	398,622	872,797	769,837
Gross profit	212,260	193,224	417,364	371,809
Operating expenses:
Selling, general and administrative	159,898	149,798	315,970	284,856
Depreciation and amortization	16,713	17,368	33,058	33,163
Total operating expenses	176,611	167,166	349,028	318,019
Operating income	35,649	26,058	68,336	53,790
Other (expense) income:
Interest expense	(7,917)	(7,154)	(15,417)	(14,731)
Write-off of debt discount and deferred financing fees		(1,466)	(74)	(6,892)
Other income, net	274	496	564	1,089
Total other (expense), net	(7,643)	(8,124)	(14,927)	(20,534)
Income before taxes	28,006	17,934	53,409	33,256
Provision for income taxes	9,983	710	20,043	6,869
Net income	$ 18,023	$ 17,224	$ 33,366	$ 26,387
Weighted average common shares outstanding:
Basic (in shares)	41,006	40,943	40,988	39,579
Diluted (in shares)	42,146	41,320	42,137	39,956
Net income per share:
Basic (in dollars per share)	$ 0.44	$ 0.42	$ 0.81	$ 0.67
Diluted (in dollars per share)	$ 0.43	$ 0.42	$ 0.79	$ 0.66
Comprehensive income:
Net income	$ 18,023	$ 17,224	$ 33,366	$ 26,387
Change in other comprehensive income, net of tax	243	100	396	12
Comprehensive income	$ 18,266	$ 17,324	$ 33,762	$ 26,399