Quarterly report pursuant to Section 13 or 15(d)

Organization and Basis of Presentation - Narrative (Details)

v3.21.2
Organization and Basis of Presentation - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
segment
business
Sep. 30, 2020
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Goodwill $ 1,757,795 $ 1,757,795 $ 593,129
Number of operating segments | segment   3  
Intangible assets, net 892,487 $ 892,487 $ 145,893
Billed, billable and unbilled accounts receivable 1,130,000 1,130,000  
Bad debt expense $ 100 $ 1,000  
Number of businesses acquired | business   2