Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Income Statement [Abstract]
Net sales		$ 3,298,823	$ 3,241,307	$ 3,116,032
Cost of sales (exclusive of depreciation and amortization shown separately below)		2,236,120	2,178,093	2,111,913
Gross profit		1,062,703	1,063,214	1,004,119
Operating expenses:
Selling, general and administrative		763,629	784,081	739,460
Depreciation and amortization		108,125	116,533	117,459
Impairment of goodwill		0	63,074	0
Total operating expenses		871,754	963,688	856,919
Operating income		190,949	99,526	147,200
Other (expense) income:
Interest expense		(53,786)	(67,718)	(73,677)
Gain on legal settlement		1,382	14,029	0
Write-off of debt discount and deferred financing fees		(4,606)	(1,331)	0
Change in fair value of financial instruments		0	0	(6,395)
Other income, net		3,155	1,819	2,913
Total other expense, net		(53,855)	(53,201)	(77,159)
Income before taxes		137,094	46,325	70,041
Provision for income taxes		31,534	22,944	14,039
Net income		$ 105,560	$ 23,381	$ 56,002
Weighted average common shares outstanding:
Basic (in shares)		42,765	41,853	40,914
Diluted (in shares)		43,343	42,504	41,589
Net income (loss) per common share:
Basic (in dollars per share)	[1]	$ 2.47	$ 0.56	$ 1.33
Diluted (in dollars per share)	[1]	$ 2.44	$ 0.55	$ 1.31
Comprehensive income (loss)
Net income		$ 105,560	$ 23,381	$ 56,002
Foreign currency translation gain (loss)		61,341	(18,257)	(22,320)
Changes in other comprehensive income (loss), net of tax		8,500	(20,251)	(4,695)
Comprehensive income (loss)		$ 175,401	$ (15,127)	$ 28,987

[1] See Note 18 for detailed calculations.