Quarterly report pursuant to Section 13 or 15(d)

Organization and Basis of Presentation - Narrative (Details)

v3.21.1
Organization and Basis of Presentation - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Goodwill $ 899,796 $ 899,796 $ 593,129
Number of operating segments | segment   3  
Intangible assets, net 240,463 $ 240,463 $ 145,893
Billed, billable and unbilled accounts receivable 760,400 760,400  
Bad debt expense $ 300 $ 900