SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Summary of Stock Options Outstanding Under Various Stock Option Plans (Details) - $ / shares	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options grated to date (in shares)	2,742,230	1,870,340
Options exercised to date (in shares)	(1,529,947)	(1,472,031)
Options outstanding (in shares)	7,429,537	7,102,753	7,078,435
2004 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options grated to date (in shares)	35,140,648
Options exercised to date (in shares)	(19,192,995)
Options cancelled to date (in shares)	(8,518,116)
Options outstanding (in shares)	7,429,537
Vesting schedule	25.00%
Minimum (in dollars per share)	$ 16.58
Maximum (in dollars per share)	$ 44.99
2004 Stock Option Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Termination grace periods	90 days
2004 Stock Option Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Termination grace periods	180 days