Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Condensed Consolidated Statements of Operations and Comprehensive Income
Net sales	$ 585,508	$ 562,523	$ 1,875,669	$ 1,704,169
Cost of sales (exclusive of depreciation and amortization shown separately below)	390,088	376,796	1,262,885	1,146,633
Gross profit	195,420	185,727	612,784	557,536
Operating expenses:
Selling, general and administrative	156,262	147,260	472,232	432,116
Depreciation and amortization	16,490	18,316	49,548	51,479
Total operating expenses	172,752	165,576	521,780	483,595
Operating income	22,668	20,151	91,004	73,941
Other (expense) income:
Interest expense	(7,871)	(7,431)	(23,288)	(22,162)
Write-off of debt discount and deferred financing fees		(211)	(74)	(7,103)
Other income, net	401	1,081	965	2,170
Total other (expense), net	(7,470)	(6,561)	(22,397)	(27,095)
Income before taxes	15,198	13,590	68,607	46,846
Provision (benefit) for income taxes	(4,488)	5,363	15,555	12,232
Net income	$ 19,686	$ 8,227	$ 53,052	$ 34,614
Weighted average common shares outstanding:
Basic (in shares)	41,036	40,943	41,004	40,035
Diluted (in shares)	42,228	41,578	42,167	40,670
Net income per share:
Basic (in dollars per share)	$ 0.48	$ 0.20	$ 1.29	$ 0.86
Diluted (in dollars per share)	$ 0.47	$ 0.20	$ 1.26	$ 0.85
Comprehensive income
Net income	$ 19,686	$ 8,227	$ 53,052	$ 34,614
Changes in other comprehensive income, net of tax	401	226	797	238
Comprehensive income	$ 20,087	$ 8,453	$ 53,849	$ 34,852