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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Additional Information (Details) - USD ($)
3 Months Ended
Nov. 12, 2020
Nov. 04, 2020
Sep. 30, 2020
Sep. 30, 2019
Nov. 05, 2020
Cash Dividends          
Dividends declared per common share (in dollars per share)     $ 0.1746 $ 0.1746  
Payments of dividends     $ 47,269,000 $ 47,006,000  
Share Capital          
Preference shares issued     0    
Treasury Stock          
Purchase of treasury stock (in shares)     965,154 300,000  
Payments for repurchase of common stock     $ 41,870,000 $ 12,424,000  
Issuance of treasury stock (in shares)     193,680 0  
Subsequent Event          
Cash Dividends          
Dividends declared per common share (in dollars per share)   $ 0.2008      
Stock Repurchase Plan          
Stock repurchase plan, authorized amount         $ 350,000,000
Subsequent Event | Forecast          
Stock Repurchase Plan          
Stock repurchase plan, period in force 12 months