Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022
Statement of Financial Position [Abstract]
Accounts receivable, allowance for credit loss, current	$ 23,603	$ 23,259
Preferred stock at par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.004	$ 0.004
Common stock, shares authorized (in shares)	350,000,000	350,000,000
Common stock, shares issued (in shares)	188,900,583	188,246,955
Common stock issued on exercise of options (note 11) (in shares)	147,064,349	146,410,721
Treasury stock, shares (in shares)	41,836,234	41,836,234