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LEASES - RIGHT-OF-USE ASSETS AND LEASE LIABILITIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
NONCURRENT ASSETS    
Operating lease assets $ 142,753 $ 131,769
Finance lease assets 13,853 71,085
Total lease assets 156,606 202,854
Current    
Operating lease liabilities 4,588 6,724
Finance lease liabilities 5,625 10,416
Noncurrent    
Operating lease liabilities 109,993 95,030
Finance lease liabilities 15,761 63,743
Total lease liabilities $ 135,967 $ 175,913