Deferred Acquisition Consideration (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Oct. 01, 2024	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Jul. 31, 2023	Oct. 01, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of contingent payments		$ 101,058	$ 101,058	$ 161,323
Payments			67,895	97,447
Adjustments to deferred acquisition consideration (2)			23,005	14,303
Additions			46,598	22,172
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)			(651)	680
Other			0	27
Ending balance of contingent payments			102,115	101,058
Business Acquisition [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value			102,115	101,058
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases			46,598	22,172
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements			(67,895)	(97,447)
Deferred acquisition consideration			28,100
Targeted Victory
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Additions		22,200
Business Acquisition [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases		22,200
Business Acquisition, Percentage of Voting Interests Acquired						26.70%
Business Acquisition, Percentage of Voting Interests Acquired, Step One & Two					50.00%	50.00%
Emerald Research Group
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Additions	$ 17,000
Business Acquisition [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	$ 17,000
Business Acquisition, Percentage of Voting Interests Acquired	40.00%
Contingent Payment
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of contingent payments		57,500	57,500
Ending balance of contingent payments			102,100	57,500
Business Acquisition [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value			102,100	57,500
Fixed payments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of contingent payments		43,600	43,600
Ending balance of contingent payments			0	43,600
Business Acquisition [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value			0	43,600
Common Class A
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of contingent payments		$ 29,300	29,300
Payments			(18,200)	(32,800)
Ending balance of contingent payments			38,400	29,300
Business Acquisition [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value			38,400	29,300
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements			$ 18,200	$ 32,800