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SHAREHOLDER'S EQUITY - AOCI Reclassifications (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other income (expense) $ (18,778) $ (3,945) $ (61,563) $ (11,944)
Income tax provision 32,031 (10,535) 5,602 494,028
Net loss (154,683) (8,008) (74,833) 480,219
Defined Benefit Pension Plan | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax provision 65 124 199 397
Net loss (226) (337) (675) (985)
Amortization of net actuarial loss on defined benefit pension plan | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other income (expense) $ (291) $ (461) $ (874) $ (1,382)