Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Exchangeable Shares	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Apr. 30, 2019		40,375
Beginning balance at Apr. 30, 2019	$ 629,176	$ 404	$ 29,639	$ 480,113	$ 145,594	$ (26,574)
Increase (Decrease) in Stockholders' Equity
Net income	23,381				23,381
Exercise of Exchangeable Shares (in shares)		1,129
Exercise of Exchangeable Shares	0	$ 11	(29,639)	29,628
Foreign currency translation gain (loss)	(18,257)					(18,257)
Other comprehensive income (loss), net of tax	(20,251)					(20,251)
Equity-based compensation	6,878			6,878
Exercise of stock options (in shares)		857
Exercise of stock options	11,793	$ 9		11,784
Vesting of restricted stock units (in shares)		78
Vesting of restricted stock units	0	$ 1		(1)
Tax withholding related to net share settlements of equity awards	(532)			(532)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		115
Issuance of common stock pursuant to employee stock purchase plan	1,793	$ 1		1,792
Ending balance (in shares) at Apr. 30, 2020		42,554
Ending balance at Apr. 30, 2020	633,981	$ 426	0	529,662	168,975	(65,082)
Increase (Decrease) in Stockholders' Equity
Net income	105,560				105,560
Repurchase and retirement of common stock (in shares)		(134)
Repurchase and retirement of common stock	(4,160)	$ (1)		(4,159)
Foreign currency translation gain (loss)	61,341					61,341
Other comprehensive income (loss), net of tax	8,500					8,500
Equity-based compensation	8,412			8,412
Exercise of stock options (in shares)		483
Exercise of stock options	7,559	$ 4		7,555
Vesting of restricted stock units (in shares)		75
Vesting of restricted stock units	0	$ 1		(1)
Tax withholding related to net share settlements of equity awards	(807)			(807)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		95
Issuance of common stock pursuant to employee stock purchase plan	$ 2,076	$ 1		2,075
Ending balance (in shares) at Apr. 30, 2021	43,073	43,073
Ending balance at Apr. 30, 2021	$ 822,462	$ 431	0	542,737	274,535	4,759
Increase (Decrease) in Stockholders' Equity
Net income	273,442				273,442
Repurchase and retirement of common stock (in shares)		(715)
Repurchase and retirement of common stock	(35,488)	$ (7)		(35,481)
Foreign currency translation gain (loss)	(25,805)					(25,805)
Other comprehensive income (loss), net of tax	15,003					15,003
Equity-based compensation	10,968			10,968
Exercise of stock options (in shares)		222
Exercise of stock options	4,434	$ 2		4,432
Vesting of restricted stock units (in shares)		123
Vesting of restricted stock units	0	$ 1		(1)
Tax withholding related to net share settlements of equity awards	(2,850)			(2,850)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		70
Issuance of common stock pursuant to employee stock purchase plan	$ 2,332	$ 1		2,331
Ending balance (in shares) at Apr. 30, 2022	42,773	42,773
Ending balance at Apr. 30, 2022	$ 1,064,498	$ 428	$ 0	$ 522,136	$ 547,977	$ (6,043)