Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Apr. 30, 2020		42,554
Beginning balance at Apr. 30, 2020	$ 633,981	$ 426	$ 529,662	$ 168,975	$ (65,082)
Increase (Decrease) in Stockholders' Equity
Net income	27,219			27,219
Foreign currency translation adjustments	16,281				16,281
Other comprehensive income, net of tax	959				959
Equity-based compensation	1,575		1,575
Exercise of stock options (in shares)		54
Exercise of stock options	691		691
Vesting of restricted stock units (in shares)		7
Tax withholding related to net share settlements of equity awards	(105)		(105)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		58
Issuance of common stock pursuant to employee stock purchase plan	1,270	$ 1	1,269
Ending balance (in shares) at Jul. 31, 2020		42,673
Ending balance at Jul. 31, 2020	$ 681,871	$ 427	533,092	196,194	(47,842)
Beginning balance (in shares) at Apr. 30, 2021	43,073	43,073
Beginning balance at Apr. 30, 2021	$ 822,462	$ 431	542,737	274,535	4,759
Increase (Decrease) in Stockholders' Equity
Net income	61,202			61,202
Repurchase and retirement of common stock (in shares)		(85)
Repurchase and retirement of common stock	(3,855)	$ (1)	(3,854)
Foreign currency translation adjustments	(8,233)				(8,233)
Other comprehensive income, net of tax	1,962				1,962
Equity-based compensation	1,958		1,958
Exercise of stock options (in shares)		44
Exercise of stock options	863	$ 1	862
Vesting of restricted stock units (in shares)		8
Tax withholding related to net share settlements of equity awards	(256)		(256)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		43
Issuance of common stock pursuant to employee stock purchase plan	$ 1,140		1,140
Ending balance (in shares) at Jul. 31, 2021	43,083	43,083
Ending balance at Jul. 31, 2021	$ 877,243	$ 431	$ 542,587	$ 335,737	$ (1,512)