SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - RSUs, DSUs and ESPP (Details) - USD ($)	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of treasury stock (in shares)	509,721	480,574	613,524
Issuance of treasury stock	$ 0	$ 6,574,000	$ 0
Restricted Share Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	484,956	15,000	0
Award vesting period	3 years
Unrecognized compensation cost relating to unvested stock awards	$ 9,000,000.0
Unvested stock awards compensation cost, weighted average recognition period	2 years 1 month 6 days
Stock issued (in shares)	0	3,334	22,627
Stock issued		$ 100,000	$ 700,000
Deferred Share Units (DSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	85,428	82,733	100,271
Stock issued (in shares)		0	51,794
Issuance of treasury stock (in shares)	23,640
Issuance of treasury stock	$ 1,100,000	$ 0	$ 2,000,000.0
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)	769,031	742,961	696,091
Cash received from employee stock purchase plan	$ 30,500,000	$ 25,300,000	$ 22,200,000

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

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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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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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Number of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.

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

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