Income Taxes (Details 5) $ in Thousands	Dec. 30, 2017 USD ($)
United States federal [Member]
Summary of tax credit carryforwards
Tax credit carryforwards	$ 87,746	[1]
California State [Member]
Summary of tax credit carryforwards
Tax credit carryforwards	52,628
States other than California [Member]
Summary of tax credit carryforwards
Tax credit carryforwards	9,153
Foreign Jurisdiction [Member]
Summary of tax credit carryforwards
Tax credit carryforwards	$ 15,160

[1] Certain of Cadence’s foreign tax credits have yet to be realized and as a result do not yet have an expiration period.