Quarterly report pursuant to Section 13 or 15(d)

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

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Business combinations - Schedule of Asset Acquired and Liabilities Assumed, VES (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Sep. 30, 2021
May 28, 2021
Dec. 31, 2021
Allocation of Assets and Liabilities as of September 30, 2021        
Goodwill $ 1,776,239 $ 1,774,406   $ 1,776,239
VES Group, Inc.        
Allocation of Assets and Liabilities as of September 30, 2021        
Cash consideration paid, net of cash acquired 1,360,231 1,360,231 $ 1,360,000  
Estimated additional cash payments 4,635 4,635    
Estimated cash consideration, net of cash acquired 1,364,866 1,364,866    
Accounts receivable - billed, billable and unbilled 44,078 44,078   44,078
Prepaid expenses and other current assets 7,955 7,955   7,955
Property and equipment, net 8,021 9,113   8,021
Operating lease right-of-use assets 18,898 18,898   18,898
Intangible assets 664,000 664,000   664,000
Other assets 7,166 7,166   7,166
Total identifiable assets acquired 750,118 751,210   750,118
Accounts payable and accrued compensation 42,182 42,182   42,182
Operating lease liabilities 18,898 18,898   18,898
Income taxes payable, current 5,673 5,673   5,673
Deferred income taxes 171,497 171,497   171,497
Other long-term liabilities 12,270 12,270   12,270
Total identifiable liabilities assumed 250,520 250,520   250,520
Net identifiable assets acquired 499,598 500,690   499,598
Goodwill 865,268 864,176   865,268
Net assets acquired $ 1,364,866 $ 1,364,866   1,364,866
Adjustments        
Cash consideration paid, net of cash acquired       0
Estimated additional cash payments       0
Estimated cash consideration, net of cash acquired       0
Accounts receivable - billed, billable and unbilled       0
Prepaid expenses and other current assets       0
Property and equipment, net       (1,092)
Operating lease right-of-use assets       0
Intangible assets       0
Other assets       0
Total identifiable assets acquired       (1,092)
Accounts payable and accrued compensation       0
Operating lease liabilities       0
Income taxes payable, current       0
Deferred income taxes       0
Other long-term liabilities       0
Total identifiable liabilities assumed       0
Net identifiable assets acquired       (1,092)
Goodwill       1,092
Net assets acquired       $ 0