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OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Summary of Amounts Reclassified from Accumulated Other Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
OCI, Net of Tax [Abstract]        
Pension amortization $ (225) $ (350) $ (451) $ (700)
Cash flow hedges 310 (34) 992 (40)
Removal of PPC foreign currency translation 0 14,866 0 14,866
Total gain (loss) 85 14,482 541 14,126
Tax benefit (expense) (18) (3,357) (114) (3,400)
Total $ 67 $ 11,125 $ 427 $ 10,726