SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Non Option Unit Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
PSUs
Units
Beginning balance (in shares)	688,462
Granted (in shares)	349,210
Vested (in shares)	(145,134)
Forfeited or expired (in shares)	(79,601)
Ending balance (in shares)	812,937	688,462
Weighted Average
Beginning balance (in dollars per share)	$ 47.96
Granted (in dollars per share)	71.84
Vested (in dollars per share)	30.39
Forfeited or expired (in dollars per share)	63.02
Ending balance (in dollars per share)	$ 61.29	$ 47.96
Weighted- Average Remaining Contractual Term (years)	1 year 10 months 20 days	1 year 8 months 23 days
Aggregate Intrinsic Value ($’000's)	$ 30,762	$ 34,974
PSUs \| Minimum
Weighted Average
Granted (in dollars per share)	$ 69.78	$ 44.56	$ 41.55
Performance target	0.00%
PSUs \| Maximum
Weighted Average
Granted (in dollars per share)	$ 75.15	$ 61.67	54.47
Performance target	200.00%
PSUs \| Long Term Incentive Plan
Weighted Average
Performance unit payout (in shares)	27,576
Restricted Share Units (RSUs)
Units
Beginning balance (in shares)	430,358
Granted (in shares)	2,470,302
Vested (in shares)	(141,452)
Forfeited or expired (in shares)	(165,501)
Ending balance (in shares)	2,593,707	430,358
Weighted Average
Beginning balance (in dollars per share)	$ 45.73
Granted (in dollars per share)	44.81	$ 45.73	46.29
Vested (in dollars per share)	45.73
Forfeited or expired (in dollars per share)	45.05
Ending balance (in dollars per share)	$ 44.90	$ 45.73
Weighted- Average Remaining Contractual Term (years)	2 years 10 months 9 days	2 years 6 months
Aggregate Intrinsic Value ($’000's)	$ 98,146	$ 21,862
Restricted Share Units (RSUs) \| Long Term Incentive Plan
Units
Beginning balance (in shares)	615,160
Granted (in shares)	246,980
Vested (in shares)	(177,082)
Forfeited or expired (in shares)	(73,315)
Ending balance (in shares)	611,743	615,160
Weighted Average
Beginning balance (in dollars per share)	$ 39.93
Granted (in dollars per share)	49.91	$ 43.39	37.34
Vested (in dollars per share)	37.36
Forfeited or expired (in dollars per share)	44.59
Ending balance (in dollars per share)	$ 44.14	$ 39.93
Weighted- Average Remaining Contractual Term (years)	1 year 7 months 13 days	1 year 8 months 1 day
Aggregate Intrinsic Value ($’000's)	$ 23,148	$ 31,250
Deferred Share Units (DSUs)
Units
Beginning balance (in shares)	806,363
Granted (in shares)	79,338
Ending balance (in shares)	885,701	806,363
Weighted Average
Beginning balance (in dollars per share)	$ 29.49
Granted (in dollars per share)	50.04	$ 40.15	$ 40.41
Ending balance (in dollars per share)	$ 31.49	$ 29.49
Weighted- Average Remaining Contractual Term (years)	4 months 9 days	4 months 9 days
Aggregate Intrinsic Value ($’000's)	$ 33,515	$ 40,963
Deferred Share Units (DSUs) \| Long Term Incentive Plan
Units
Beginning balance (in shares)	60,011
Ending balance (in shares)	55,520	60,011

Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Payout

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Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Target Based Award, Performance Target

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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