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SHAREHOLDERS' EQUITY - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Oct. 01, 2018
Rollforward of accumulated other comprehensive income (loss), net of tax        
Balance $ 4,382,735 $ 4,164,591 $ 4,560,925  
Amounts reclassified from accumulated other comprehensive loss (11,875)      
Net current-period other comprehensive loss (11,875) 14,250 2,504  
Balance 4,012,223 4,382,735 4,164,591  
Adoption of ASU 2016-01        
Rollforward of accumulated other comprehensive income (loss), net of tax        
Adoption of ASU       $ 0
Adoption of ASU 2018-02        
Rollforward of accumulated other comprehensive income (loss), net of tax        
Adoption of ASU       0
Unrealized Appreciation on Equity Securities        
Rollforward of accumulated other comprehensive income (loss), net of tax        
Balance 29,071      
Adjusted balance       0
Amounts reclassified from accumulated other comprehensive loss 0      
Net current-period other comprehensive loss 0      
Balance 0 29,071    
Unrealized Appreciation on Equity Securities | Adoption of ASU 2016-01        
Rollforward of accumulated other comprehensive income (loss), net of tax        
Adoption of ASU       (29,071)
Unrealized Appreciation on Equity Securities | Adoption of ASU 2018-02        
Rollforward of accumulated other comprehensive income (loss), net of tax        
Adoption of ASU       0
Defined Benefit Pension Plan        
Rollforward of accumulated other comprehensive income (loss), net of tax        
Balance (12,521)      
Adjusted balance       (16,760)
Amounts reclassified from accumulated other comprehensive loss (11,875)      
Net current-period other comprehensive loss (11,875)      
Balance (28,635) (12,521)    
Defined Benefit Pension Plan | Adoption of ASU 2016-01        
Rollforward of accumulated other comprehensive income (loss), net of tax        
Adoption of ASU       0
Defined Benefit Pension Plan | Adoption of ASU 2018-02        
Rollforward of accumulated other comprehensive income (loss), net of tax        
Adoption of ASU       (4,239)
Accumulated Other Comprehensive Income (Loss)        
Rollforward of accumulated other comprehensive income (loss), net of tax        
Balance 16,550 2,300 (204)  
Adjusted balance       (16,760)
Net current-period other comprehensive loss (11,875) 14,250 2,504  
Balance $ (28,635) $ 16,550 $ 2,300  
Accumulated Other Comprehensive Income (Loss) | Adoption of ASU 2016-01        
Rollforward of accumulated other comprehensive income (loss), net of tax        
Adoption of ASU       (29,071)
Accumulated Other Comprehensive Income (Loss) | Adoption of ASU 2018-02        
Rollforward of accumulated other comprehensive income (loss), net of tax        
Adoption of ASU       $ (4,239)