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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Non Option Unit Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Weighted Average      
Issuance of treasury stock (in shares) 120,406 141,452  
PSUs      
Units      
Beginning balance (in shares) 812,937    
Granted (in shares) 526,865    
Vested (in shares) 0    
Forfeited or expired (in shares) (58,350)    
Ending balance (in shares) 1,281,452   812,937
Weighted Average      
Beginning balance (in dollars per share) $ 61.29    
Granted (in dollars per share) 54.70    
Vested (in dollars per share) 0    
Forfeited or expired (in dollars per share) 67.10    
Ending balance (in dollars per share) $ 58.37   $ 61.29
Weighted- Average Remaining Contractual Term (years) 2 years 1 month 13 days   1 year 10 months 20 days
Aggregate Intrinsic Value ($’000's) $ 33,882   $ 30,762
PSUs | Minimum      
Weighted Average      
Performance target 0.00%    
PSUs | Maximum      
Weighted Average      
Performance target 200.00%    
Restricted share units      
Units      
Beginning balance (in shares) 2,593,707    
Granted (in shares) 0    
Vested (in shares) (120,406)    
Forfeited or expired (in shares) (88,587)    
Ending balance (in shares) 2,384,714   2,593,707
Weighted Average      
Beginning balance (in dollars per share) $ 44.90    
Granted (in dollars per share) 0    
Vested (in dollars per share) 37.83    
Forfeited or expired (in dollars per share) 44.84    
Ending balance (in dollars per share) $ 44.86   $ 44.90
Weighted- Average Remaining Contractual Term (years) 2 years 8 months 4 days   2 years 10 months 9 days
Aggregate Intrinsic Value ($’000's) $ 63,052   $ 98,146
Restricted share units | Long Term Incentive Plan      
Units      
Beginning balance (in shares) 611,743    
Granted (in shares) 394,584    
Vested (in shares) 0    
Forfeited or expired (in shares) (45,030)    
Ending balance (in shares) 961,297   611,743
Weighted Average      
Beginning balance (in dollars per share) $ 44.14    
Granted (in dollars per share) 38.97    
Vested (in dollars per share) 0    
Forfeited or expired (in dollars per share) 45.85    
Ending balance (in dollars per share) $ 41.94   $ 44.14
Weighted- Average Remaining Contractual Term (years) 2 years 25 days   1 year 7 months 13 days
Aggregate Intrinsic Value ($’000's) $ 25,417   $ 23,148
Deferred Share Units (DSUs)      
Units      
Beginning balance (in shares) 885,701    
Granted (in shares) 13,747    
Ending balance (in shares) 899,448   885,701
Weighted Average      
Beginning balance (in dollars per share) $ 31.49    
Granted (in dollars per share) 32.41    
Ending balance (in dollars per share) $ 31.50   $ 31.49
Weighted- Average Remaining Contractual Term (years) 1 month 6 days   4 months 9 days
Aggregate Intrinsic Value ($’000's) $ 21,934   $ 33,515
Deferred Share Units (DSUs) | Long Term Incentive Plan      
Units      
Beginning balance (in shares) 55,520    
Ending balance (in shares)     55,520