SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - RSUs, DSUs and ESPP (Details) - USD ($) $ in Millions	3 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Restricted Share Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	0	484,956
Award vesting period	3 years
Unrecognized compensation cost relating to unvested stock awards	$ 6.6
Unvested stock awards compensation cost, weighted average recognition period	1 year 6 months
Stock issued (in shares)	141,452
Stock issued	$ 5.9	$ 0.0
Deferred Share Units (DSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	5,335	3,667
Stock issued (in shares)	0	0
Employee Share Purchase Plan (ESPP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards purchase price discount	15.00%
Common shares eligible for issuance (in shares)	225,731	200,772
Cash received from employee stock purchase plan	$ 9.4	$ 7.2

Cash collected to be used to purchase Common Stock in future periods

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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