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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Schedule of Weighted-Average Fair Value Of Options And Weighted-Average Assumptions Used (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value of options granted (in dollars per share) $ 6.75 $ 9.02 $ 8.45
Weighted-average assumptions used:      
Expected volatility 28.73% 26.39% 26.26%
Risk–free interest rate 3.98% 1.15% 0.24%
Expected dividend yield 3.07% 1.78% 1.55%
Expected life (in years) 4 years 2 months 12 days 4 years 1 month 24 days 4 years 7 months 2 days
Forfeiture rate (based on historical rates) 7.00% 7.00% 7.00%
Average exercised share price (in dollars per share) $ 31.13 $ 48.20 $ 45.76
Performance Share Units (issued under LTIP)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value of options granted (in dollars per share) $ 8.09 $ 0 $ 10.18
Derived service period (in years) 1 year 8 months 12 days 0 years 1 year 9 months 18 days
Weighted-average assumptions used:      
Expected volatility 26.00% 0.00% 28.00%
Risk–free interest rate 3.21% 0.00% 0.42%
Expected dividend yield 2.00% 0.00% 1.70%
Average exercised share price (in dollars per share) $ 31.89 $ 0 $ 45.81
PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value of instruments other than options granted (in dollars per share) $ 54.38    
Weighted-average assumptions used:      
Expected volatility 29.00% 28.00% 28.00%
Expected dividend yield     1.70%
Expected life (in years) 3 years 1 month 9 days 3 years 1 month 6 days 3 years 1 month 2 days
Forfeiture rate (based on historical rates) 7.00% 7.00% 7.00%
Average exercised share price (in dollars per share) $ 41.75 $ 30.39 $ 25.76
Aggregate intrinsic value of performance share units vested ($ in ‘000’s) $ 6,216 $ 10,370 $ 4,286
PSUs | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value of instruments other than options granted (in dollars per share) $ 43.10 $ 69.78 $ 44.56
Weighted-average assumptions used:      
Risk–free interest rate 3.13% 0.45% 0.15%
Expected dividend yield 0.00% 1.70%  
PSUs | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value of instruments other than options granted (in dollars per share) $ 55.06 $ 75.15 $ 61.67
Weighted-average assumptions used:      
Risk–free interest rate 3.39% 0.71% 0.24%
Expected dividend yield   1.80%  
Restricted Share Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value of instruments other than options granted (in dollars per share) $ 30.46 $ 44.81 $ 45.73
Weighted-average fair value of restricted share units vested (in dollars per share) $ 36.33 $ 45.73 $ 0
Weighted-average assumptions used:      
Aggregate intrinsic value of performance share units vested ($ in ‘000’s) $ 15,755 $ 7,406 $ 0
Restricted Share Units (RSUs) | Long Term Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value of instruments other than options granted (in dollars per share) $ 38.82 $ 49.91 $ 43.39
Weighted-average fair value of restricted share units vested (in dollars per share) $ 36.83 $ 37.36 $ 32.93
Weighted-average assumptions used:      
Aggregate intrinsic value of performance share units vested ($ in ‘000’s) $ 3,947 $ 9,139 $ 7,832
Deferred Share Units (DSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value of instruments other than options granted (in dollars per share) $ 29.72 $ 50.04 $ 40.15
Weighted-average fair value of restricted share units vested (in dollars per share) $ 32.44 $ 41.24 $ 41.48
Weighted-average assumptions used:      
Aggregate intrinsic value of performance share units vested ($ in ‘000’s) $ 1,565 $ 4,133 $ 3,109