Income Taxes - Operating Loss and Tax Credit Carryforwards (Details) $ in Millions	Jan. 02, 2021 USD ($)
Federal | Research and development tax credit
Operating loss and tax credit carryforwards
Tax credit carryforwards	$ 10.5
Foreign
Operating loss and tax credit carryforwards
Tax credit carryforwards	0.6
State
Operating loss and tax credit carryforwards
Operating loss carryforwards	31.6
State | Tentative minimum tax credit
Operating loss and tax credit carryforwards
Tax credit carryforwards	0.1
State | Research and development tax credit
Operating loss and tax credit carryforwards
Tax credit carryforwards	13.0
Silicon Clocks, Spectra Linear and Ember | Federal
Operating loss and tax credit carryforwards
Operating loss carryforwards	23.2
Silicon Clocks, Spectra Linear and Ember | Federal | Research and development tax credit
Operating loss and tax credit carryforwards
Tax credit carryforwards	$ 1.9