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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Unbilled Receivables (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Receivables [Abstract]  
1 year or less $ 208,823
1-2 years 91,325
2-5 years 17,131
Total $ 317,279
Percentage of unbilled receivables, 1 year or less 66.00%
Percentage of unbilled receivables, 1-2 years 29.00%
Percentage of unbilled receivables, 2-5 years 5.00%
Total percentage of unbilled receivables 100.00%