Annual report pursuant to Section 13 and 15(d)

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

v3.22.2.2
Business Combinations - Schedule of Asset Acquired and Liabilities Assumed, Attain (Details) - USD ($)
$ in Thousands
Mar. 01, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Liabilities assumed:        
Goodwill   $ 1,779,415 $ 1,774,406 $ 593,129
Attain        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]        
Cash consideration paid, net of cash acquired $ 419,097      
Assets acquired:        
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      
Liabilities assumed:        
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