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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - IMPACT OF ASC 740 ON THE UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCK EQUITY (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2021
Jun. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance as of beginning of period $ 1,821,833 $ 1,698,214 $ 1,643,896 $ 1,654,737 $ 1,608,092 $ 1,345,615 $ 1,643,896 $ 1,345,615
Net (loss) income (111,831) 149,809 81,045 (19,298) 73,846 75,752 119,023 130,300
Balance as of end of period 1,682,066 1,821,833 1,698,214 1,612,478 1,654,737 1,608,092 1,682,066 1,612,478
Retained Earnings                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance as of beginning of period 1,114,382 996,580 947,501 959,722 915,764 869,858 947,501 869,858
Net (loss) income (111,831) 149,809 81,045 (19,298) 73,846 75,752    
Balance as of end of period $ 970,511 $ 1,114,382 996,580 910,476 959,722 915,764 970,511 910,476
As Previously Reported                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance as of beginning of period     1,844,692 1,889,107 1,827,803 1,551,717 1,844,692 1,551,717
Net (loss) income       (27,219) 88,505 89,361   150,647
Balance as of end of period       1,838,927 1,889,107 1,827,803   1,838,927
As Previously Reported | Retained Earnings                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance as of beginning of period       1,194,092 1,135,475 1,075,960   1,075,960
Net (loss) income       (27,219) 88,505 89,361    
Balance as of end of period       1,136,925 1,194,092 1,135,475   1,136,925
Effect of Change                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance as of beginning of period     $ (200,796) (234,370) (219,711) (206,102) $ (200,796) (206,102)
Net (loss) income       7,921 (14,659) (13,609)   (20,347)
Balance as of end of period       (226,449) (234,370) (219,711)   (226,449)
Effect of Change | Retained Earnings                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance as of beginning of period       (234,370) (219,711) (206,102)   (206,102)
Net (loss) income       7,921 (14,659) (13,609)    
Balance as of end of period       $ (226,449) $ (234,370) $ (219,711)   $ (226,449)