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Contract Balances and Performance Obligations - Receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]    
Billed $ 187,071 $ 211,776
Unbilled 178,839 181,550
Receivables Gross 365,910 393,326
Less: allowance for doubtful accounts (4,718) (5,072)
Net receivables 361,192 388,254
Less: long-term receivables * (50,566) (54,074)
Short-term receivables * $ 310,626 $ 334,180