Stock-Based Compensation Unrecognized Compensation Cost (Details) $ in Millions	Sep. 28, 2018 USD ($)
Stock-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 104.5
Stock Awards
Stock-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	52.8
Stock options
Stock-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 51.7