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, 2019		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]
Release of common stock shares upon vesting of restricted stock units (in shares)		100,186
Shares withheld for the withholding tax on vesting of restricted stock units (in shares)		(30,789)
Shares withheld for the withholding tax on vesting of restricted stock units	(580)	$ (580)
Stock-based compensation	5,054	$ 5,054
Foreign currency translation gain (loss)	(140)			(140)
Net income	26,346				26,345	1
Ending balance (in shares) at Sep. 30, 2019		51,358,810	(1,333,125)
Ending balance at Sep. 30, 2019	$ 971,856	$ 354,157	$ (20,491)	(220)	638,248	162
Beginning balance (in shares) at Jun. 30, 2020	52,408,703	53,741,828	(1,333,125)
Beginning balance at Jun. 30, 2020	$ 1,065,707	$ 389,972	$ (20,491)	(152)	696,211	167
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, net of taxes (in shares)	350,830	350,830
Exercise of stock options, net of taxes	$ 5,020	$ 5,020
Release of common stock shares upon vesting of restricted stock units (in shares)		217,519
Shares withheld for the withholding tax on vesting of restricted stock units (in shares)		(69,131)
Shares withheld for the withholding tax on vesting of restricted stock units	(2,005)	$ (2,005)
Stock repurchases (in shares)			(1,142,294)
Stock repurchases	(30,000)		$ (30,000)
Stock-based compensation	7,170	$ 7,170
Foreign currency translation gain (loss)	247			247
Net income	$ 26,603				26,601	2
Ending balance (in shares) at Sep. 30, 2020	51,765,627	54,241,046	(2,475,419)
Ending balance at Sep. 30, 2020	$ 1,072,742	$ 400,157	$ (50,491)	$ 95	$ 722,812	$ 169