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INCOME TAXES - Unrecognized Tax Benefits, Interest & Penalties (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Unrecognized Tax Benefits      
Unrecognized tax benefits at the beginning of the fiscal year $ 94,311,000 $ 126,073,000 $ 130,530,000
Unrecognized tax benefits, decrease resulting from prior period tax positions [1]   (1,401,000)  
Unrecognized tax benefits, increase resulting from prior period tax positions [1] 10,109,000   2,152,000
Gross amount of the increases in unrecognized tax benefits as a result of tax positions taken during the current year 6,669,000 2,565,000 2,660,000
Amount of decreases in unrecognized tax benefits relating the settlements with taxing authorities, including the utilization of tax attributes 0 (8,000,000) 0
Reductions to unrecognized tax benefits resulting from the lapse of the applicable statute of limitations (3,173,000) (24,768,000) (7,430,000)
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation (528,000) (158,000) (1,839,000)
Unrecognized tax benefits at the end of the fiscal year 107,388,000 94,311,000 126,073,000
Total amounts of unrecognized tax benefits that, if upon resolution of the uncertain tax positions would reduce Cadence's effective tax rate 106,420,000 93,398,000 121,415,000
Reasonably possible decrease in unrecognized tax benefits 9,400,000    
Interest and penalties recognized in Income Statements      
Interest 3,893,000 2,282,000 434,000
Penalties 143,000 267,000 $ 7,000
Interest and penalties recognized in Balance Sheets      
Interest 9,010,000 4,813,000  
Penalties $ 1,261,000 $ 0  
[1] Includes unrecognized tax benefits of tax positions recorded in connection with acquisitions