PA Consulting Business Combination - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 30, 2022	Sep. 30, 2022	Mar. 02, 2021
Assets
Goodwill	$ 7,341,082	$ 7,184,658
PA Consulting Group Limited
Assets
Cash and cash equivalents			$ 134,900
Receivables			166,500
Property, equipment and improvements, net			40,500
Goodwill			1,454,000
Identifiable intangible assets			1,004,200
Prepaid expenses and other current assets			9,500
Miscellaneous long term assets			84,000
Total Assets			2,893,600
Liabilities
Accounts payable			6,500
Accrued liabilities and other current liabilities			354,800
Other long term liabilities			248,000
Total Liabilities			609,300
Redeemable Noncontrolling interests			582,400
Net assets acquired			$ 1,701,900