Annual report pursuant to Section 13 and 15(d)

Business combinations - Schedule of Asset Acquired and Liabilities Assumed, Attain (Details)

v3.21.2
Business combinations - Schedule of Asset Acquired and Liabilities Assumed, Attain (Details) - USD ($)
$ in Thousands
Mar. 01, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Initial Allocation of Assets and Liabilities        
Goodwill   $ 1,774,406 $ 593,129 $ 584,469
Attain        
Initial Allocation of Assets and Liabilities        
Cash consideration paid, net of cash acquired $ 419,097      
Accounts receivable - billed, billable and unbilled 39,375      
Prepaid expenses and other current assets 926      
Operating lease right-of-use assets 24,960      
Intangible assets 105,000      
Other assets 74      
Total identifiable assets acquired 170,335      
Accounts payable and other liabilities 28,863      
Operating lease liabilities 26,401      
Total identifiable liabilities assumed 55,264      
Net identifiable assets acquired 115,071      
Goodwill 304,026      
Net assets acquired $ 419,097