CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 35,834	$ 33,171	$ 107,845	$ 106,625
Other comprehensive gain (loss:)
Net unrealized gains (losses) on available for sale securities, net of tax effects of $(8) and $1 for the three and nine months ended March 31, 2017, and $(7) and $(11) for the three and nine months ended March 31, 2016	16	13	(1)	21
Foreign currency translation adjustments	86	(31)	(2,534)	(2,192)
Total other comprehensive gain (loss)	102	(18)	(2,535)	(2,171)
Comprehensive income	$ 35,936	$ 33,153	$ 105,310	$ 104,454