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Income Taxes (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Jan. 01, 2022
Jan. 02, 2021
Unrecognized Tax Benefits      
Unrecognized tax benefits at the beginning of the fiscal year $ 130,530 $ 113,021 $ 106,041
Gross amount of the increases in unrecognized tax benefits of tax positions taken during the current year [1] 2,152 15,414 5,037
Gross amount of the increases in unrecognized tax benefits as a result of tax positions taken during the current year 2,660 5,100 3,344
Amount of decreases in unrecognized tax benefits relating the settlements with taxing authorities, including the utilization of tax attributes 0 (270) (1,316)
Reductions to unrecognized tax benefits resulting from the lapse of the applicable statute of limitations (7,430) (2,778) (676)
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation (1,839)    
Effect of foreign currency translation   43 591
Unrecognized tax benefits at the end of the fiscal year 126,073 130,530 113,021
Total amounts of unrecognized tax benefits that, if upon resolution of the uncertain tax positions would reduce Cadence's effective tax rate 121,415 79,654 66,010
Interest and penalties recognized in Income Statements      
Interest 434 1,171 473
Penalties 7 (11) $ (3)
Interest and penalties recognized in Balance Sheets      
Interest 5,133 4,921  
Penalties $ 0 $ 0  
[1] Includes unrecognized tax benefits of tax positions recorded in connection with acquisitions