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, 2018	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options grated to date (in shares)	1,322,340	2,278,974
Options exercised to date (in shares)	(2,869,569)	(1,012,644)
Options outstanding (in shares)	7,078,435	8,977,830	8,354,816
2004 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options grated to date (in shares)	30,528,078
Options exercised to date (in shares)	(16,191,017)
Options cancelled to date (in shares)	(7,258,626)
Options outstanding (in shares)	7,078,435
Vesting schedule	25.00%
Minimum (in dollars per share)	$ 11.68
Maximum (in dollars per share)	$ 36.50
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