Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Consolidated Balance Sheets [Abstract]
Accounts receivable, net allowance for doubtful accounts	$ 19,258	$ 11,150
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.004	$ 0.004
Common stock, shares authorized	350,000,000	350,000,000
Common stock, shares issued	184,315,866	183,260,958
Common stock, shares outstanding	142,679,632	142,174,724
Treasury stock, shares held	41,636,234	41,086,234