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LEASES - Effect of the Change in Accounting Policy (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Oct. 01, 2019
Sep. 30, 2019
Other Noncurrent Assets:      
Operating lease right-of-use asset $ 48,730 $ 56,071 $ 0
Current Liabilities:      
Accrued liabilities 13,412 16,277  
Noncurrent Liabilities:      
Other $ 35,318 39,794  
Adjustments      
Other Noncurrent Assets:      
Operating lease right-of-use asset   56,071  
Current Liabilities:      
Accrued liabilities   16,277  
Noncurrent Liabilities:      
Other   $ 39,794