SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Summary of Outstanding Stock Options, Narrative (Details) - USD ($)	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	7,429,537	7,102,753	7,078,435
Cash used to settle awards	$ 0	$ 0	$ 0
Capitalized amount of share-based compensation costs	0	0	0
Cash proceeds from exercise of options granted	41,300,000	35,600,000	54,400,000
Tax benefit realized from exercise of options	$ 1,900,000	$ 2,900,000	$ 1,500,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	7,429,537
Common shares available for issuance (in shares)	7,540,748
Expiration period of options, minimum term	7 years
Expiration period of options, maximum term	10 years
Unrecognized compensation cost relating to unvested stock awards	$ 29,700,000
Unvested stock awards compensation cost, weighted average recognition period	2 years 10 months 24 days
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years

Share-based Compensation Arrangement by Share-based Payment Award, Award Expire Period, Maximum

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Share-based Compensation Arrangement by Share-based Payment Award, Award Expire Period, Minimum

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Amount of cost capitalized for award under share-based payment arrangement.

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of options outstanding, including both vested and non-vested options.

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