Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Condensed Consolidated Statements of Operations and Comprehensive Income
Net sales	$ 761,352	$ 723,902	$ 2,470,457	$ 2,335,883
Cost of sales (exclusive of depreciation and amortization shown separately below)	507,879	489,676	1,658,837	1,588,691
Gross profit	253,473	234,226	811,620	747,192
Operating expenses:
Selling, general and administrative	193,384	178,180	588,472	548,883
Depreciation and amortization	29,422	30,220	88,215	87,329
Total operating expenses	222,806	208,400	676,687	636,212
Operating income	30,667	25,826	134,933	110,980
Other (expense) income:
Interest expense	(16,474)	(19,526)	(52,310)	(54,896)
Change in fair value of financial instruments				(6,395)
Write-off of debt discount and deferred financing fees			(707)
Other (expense) income, net	(498)	957	1,254	2,025
Total other expense, net	(16,972)	(18,569)	(51,763)	(59,266)
Income before taxes	13,695	7,257	83,170	51,714
Provision for income taxes	2,816	1,442	18,333	12,337
Net income	$ 10,879	$ 5,815	$ 64,837	$ 39,377
Weighted average common shares outstanding:
Basic (in shares)	42,223	40,912	41,663	41,053
Diluted (in shares)	42,949	41,371	42,401	41,789
Net income per common share:
Basic (in dollars per share)	$ 0.26	$ 0.14	$ 1.55	$ 0.94
Diluted (in dollars per share)	$ 0.25	$ 0.14	$ 1.52	$ 0.92
Comprehensive income
Net income	$ 10,879	$ 5,815	$ 64,837	$ 39,377
Foreign currency translation income (loss)	(2,504)	(128)	8,947	(8,821)
Changes in other comprehensive income, net of tax	(547)		(10,214)	491
Comprehensive income	$ 7,828	$ 5,687	$ 63,570	$ 31,047