Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock and Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Retained Earnings	Non-controlling Interest
Beginning balance (in shares) at Jun. 30, 2018		50,914,571	(1,333,125)
Beginning balance at Jun. 30, 2018	$ 843,652	$ 331,550	$ (20,491)	$ 165	$ 532,271	$ 157
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Release of common stock shares upon vesting of restricted stock units (in shares)		439,379
Shares withheld for the withholding tax on vesting of restricted stock units (in shares)		(138,911)
Shares withheld for the withholding tax on vesting of restricted stock units	(2,323)	$ (2,323)
Stock-based compensation	16,081	$ 16,081
Foreign currency translation (loss) gain	(177)			(177)
Net income	48,211				48,208	3
Ending balance (in shares) at Mar. 31, 2019		51,215,039	(1,333,125)
Ending balance at Mar. 31, 2019	913,158	$ 345,308	$ (20,491)	(12)	588,193	160
Beginning balance (in shares) at Dec. 31, 2018		51,136,062	(1,333,125)
Beginning balance at Dec. 31, 2018	898,211	$ 341,070	$ (20,491)	(72)	577,547	157
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Release of common stock shares upon vesting of restricted stock units (in shares)		118,617
Shares withheld for the withholding tax on vesting of restricted stock units (in shares)		(39,640)
Shares withheld for the withholding tax on vesting of restricted stock units	(722)	$ (722)
Stock-based compensation	4,960	$ 4,960
Foreign currency translation (loss) gain	60			60
Net income	10,649				10,646	3
Ending balance (in shares) at Mar. 31, 2019		51,215,039	(1,333,125)
Ending balance at Mar. 31, 2019	$ 913,158	$ 345,308	$ (20,491)	(12)	588,193	160
Beginning balance (in shares) at Jun. 30, 2019	49,956,288	51,289,413	(1,333,125)
Beginning balance at Jun. 30, 2019	$ 941,176	$ 349,683	$ (20,491)	(80)	611,903	161
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, net of shares withheld for withholding taxes (in shares)	1,454,507	1,447,296
Exercise of stock options, net of shares withheld for withholding taxes	$ 23,053	$ 23,053
Release of common stock shares upon vesting of restricted stock units (in shares)		771,721
Shares withheld for the withholding tax on vesting of restricted stock units (in shares)		(259,659)
Shares withheld for the withholding tax on vesting of restricted stock units	(6,434)	$ (6,434)
Stock-based compensation	14,823	$ 14,823
Foreign currency translation (loss) gain	(86)			(86)
Net income	$ 65,863				65,858	5
Ending balance (in shares) at Mar. 31, 2020	51,915,646	53,248,771	(1,333,125)
Ending balance at Mar. 31, 2020	$ 1,038,395	$ 381,125	$ (20,491)	(166)	677,761	166
Beginning balance (in shares) at Dec. 31, 2019		51,923,260	(1,333,125)
Beginning balance at Dec. 31, 2019	1,001,553	$ 360,060	$ (20,491)	(135)	661,954	165
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, net of shares withheld for withholding taxes (in shares)		1,163,309
Exercise of stock options, net of shares withheld for withholding taxes	19,120	$ 19,120
Release of common stock shares upon vesting of restricted stock units (in shares)		262,742
Shares withheld for the withholding tax on vesting of restricted stock units (in shares)		(100,540)
Shares withheld for the withholding tax on vesting of restricted stock units	(2,860)	$ (2,860)
Stock-based compensation	4,805	$ 4,805
Foreign currency translation (loss) gain	(31)			(31)
Net income	$ 15,808				15,807	1
Ending balance (in shares) at Mar. 31, 2020	51,915,646	53,248,771	(1,333,125)
Ending balance at Mar. 31, 2020	$ 1,038,395	$ 381,125	$ (20,491)	$ (166)	$ 677,761	$ 166