ACQUISITIONS (Narrative) (Details) $ in Thousands				9 Months Ended	12 Months Ended
	Jan. 02, 2025 USD ($)	Dec. 02, 2024 USD ($)	Nov. 01, 2024 USD ($) professional	Sep. 30, 2025 USD ($) business	Dec. 31, 2024 USD ($) business
2025 Acquisition
Business Combination [Line Items]
Number of acquisitions | business				1
Cash consideration				$ 8,800
Contingent consideration fair value				900
2025 Acquisition | Customer relationships
Business Combination [Line Items]
Finite-lived intangible assets acquired				4,000
First Derivative
Business Combination [Line Items]
Cash consideration		$ 300,700
Finite-lived intangible assets acquired				124,809
Increase (decrease) in fair value of contingent consideration				600
NEORIS purchase accounting adjustment				900
First Derivative | Customer relationships
Business Combination [Line Items]
Finite-lived intangible assets acquired				118,441
NEORIS
Business Combination [Line Items]
Cash consideration			$ 626,300
Finite-lived intangible assets acquired				259,000
Percentage of shares acquired	0.30%		99.70%
Number of professionals | professional			4,800
Payments to acquire businesses	$ 1,400
Increase (decrease) in fair value of contingent consideration				3,900
NEORIS purchase accounting adjustment				(5,442)
NEORIS | Customer relationships
Business Combination [Line Items]
Finite-lived intangible assets acquired				249,000
Other 2024 Acquisitions
Business Combination [Line Items]
Number of acquisitions | business					3
NEORIS purchase accounting adjustment				$ 760
2024 Acquisitions
Business Combination [Line Items]
Cash consideration					$ 74,200
Contingent consideration fair value					9,800
2024 Acquisitions | Customer relationships
Business Combination [Line Items]
Finite-lived intangible assets acquired					$ 20,300