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Contract Balances and Performance Obligations - Receivables (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]    
Billed $ 157,777 $ 211,776
Unbilled 168,818 181,550
Receivables Gross 326,595 393,326
Less: allowance for doubtful accounts (4,505) (5,072)
Net receivables 322,090 388,254
Less: long-term receivables * (41,492) (54,074)
Short-term receivables * $ 280,598 $ 334,180