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Contract Balances and Performance Obligations - Receivables (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]    
Billed $ 155,838 $ 211,776
Unbilled 159,891 181,550
Receivables Gross 315,729 393,326
Less: allowance for doubtful accounts (4,931) (5,072)
Net receivables 310,798 388,254
Less: long-term receivables * (45,994) (54,074)
Short-term receivables * $ 264,804 $ 334,180