Income Taxes (Details 4) $ in Thousands	Dec. 28, 2019 USD ($)
United States federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carry forwards	$ 1,059
Tax credit carryforward	100,128	[1]
California State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carry forwards	28,820
Tax credit carryforward	72,897
States other than California [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carry forwards	1,853
Tax credit carryforward	11,286
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carry forwards	2,113
Tax credit carryforward	$ 21,697

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