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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, 2022
Jun. 30, 2021
Jun. 30, 2020
Long Term Incentive Plan      
Weighted-average assumptions used:      
Compensation cost related to unvested awards not yet recognized $ 35,000    
Unvested stock awards compensation cost, weighted average recognition period 1 year 10 months 24 days    
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value of options granted (in dollars per share) $ 9.02 $ 8.45 $ 6.88
Weighted-average assumptions used:      
Expected volatility 26.39% 26.26% 22.63%
Risk–free interest rate 1.15% 0.24% 1.30%
Expected dividend yield 1.78% 1.55% 1.64%
Expected life (in years) 4 years 1 month 24 days 4 years 7 months 2 days 4 years 1 month 13 days
Forfeiture rate (based on historical rates) 7.00% 7.00% 7.00%
Average exercised share price (in dollars per share) $ 48.20 $ 45.76 $ 41.81
Unvested stock awards compensation cost, weighted average recognition period 2 years 9 months 18 days    
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) $ 10.18    
Weighted-average assumptions used:      
Expected volatility 28.00%    
Risk–free interest rate 0.42%    
Expected dividend yield 1.70%    
Average exercised share price (in dollars per share) $ 45.81    
Derived service period (in years) 1 year 9 months 18 days    
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) $ 71.84    
Weighted-average assumptions used:      
Expected volatility 28.00% 28.00% 21.00%
Expected dividend yield   1.70% 1.70%
Expected life (in years) 3 years 1 month 6 days 3 years 1 month 2 days 3 years 29 days
Forfeiture rate (based on historical rates) 7.00% 7.00% 7.00%
Average exercised share price (in dollars per share) $ 30.39 $ 25.76 $ 23.88
Aggregate intrinsic value of performance share units vested ($ in ‘000’s) $ 10,370 $ 4,286 $ 2,685
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) $ 69.78 $ 44.56 $ 41.55
Weighted-average assumptions used:      
Risk–free interest rate 0.45% 0.15% 1.35%
Expected dividend yield 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) $ 75.15 $ 61.67 $ 54.47
Weighted-average assumptions used:      
Risk–free interest rate 0.71% 0.24% 1.59%
Expected dividend yield 1.80%    
PSUs | Long Term Incentive Plan      
Weighted-average assumptions used:      
Compensation cost related to unvested awards not yet recognized $ 23,000    
Unvested stock awards compensation cost, weighted average recognition period 1 year 10 months 24 days    
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) $ 44.81 $ 45.73 $ 46.29
Weighted-average assumptions used:      
Aggregate intrinsic value of performance share units vested ($ in ‘000’s) $ 7,406 $ 0 $ 132
Weighted-average fair value of restricted share units vested (in dollars per share) $ 45.73 $ 0 $ 34.31
Compensation cost related to unvested awards not yet recognized $ 91,300    
Unvested stock awards compensation cost, weighted average recognition period 2 years    
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) $ 49.91 $ 43.39 $ 37.34
Weighted-average assumptions used:      
Aggregate intrinsic value of performance share units vested ($ in ‘000’s) $ 9,139 $ 7,832 $ 8,184
Weighted-average fair value of restricted share units vested (in dollars per share) $ 37.36 $ 32.93 $ 29.98
Compensation cost related to unvested awards not yet recognized $ 11,900    
Unvested stock awards compensation cost, weighted average recognition period 1 year 3 months 18 days    
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) $ 50.04 $ 40.15 $ 40.41
Weighted-average assumptions used:      
Aggregate intrinsic value of performance share units vested ($ in ‘000’s) $ 4,133 $ 3,109 $ 3,929
Weighted-average fair value of restricted share units vested (in dollars per share) $ 41.24 $ 41.48 $ 35.17