SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - RSUs, DSUs and ESPP (Details) - USD ($)	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	15,000	0	4,464
Award vesting period	3 years
Stock issued (in shares)	3,334	22,627	98,625
Stock issued	$ 100,000	$ 700,000	$ 2,100,000
Deferred Share Units (DSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	82,733	100,271	87,501
Stock issued (in shares)	0	51,794	0
Stock issued		$ 2,000,000.0	$ 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)	742,961	696,091	729,521
Cash received from employee stock purchase plan	$ 25,300,000	$ 22,200,000	$ 21,500,000

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

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Share-based Compensation Arrangement by Share-based Payment Award, Shares Eligible for Issuance

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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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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Aggregate value of stock related to Restricted Stock Awards issued during the period.

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