Income Taxes (Details 4) $ in Thousands	Dec. 29, 2018 USD ($)
United States federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carry forwards	$ 1,374
Tax credit carryforward	108,934	[1]
California State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carry forwards	175,541
Tax credit carryforward	61,473
States other than California [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carry forwards	2,333
Tax credit carryforward	10,445
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carry forwards	293
Tax credit carryforward	$ 16,672

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