Nature of Operations and Significant Accounting Policies - New Accounting Pronouncements (Details) - Accounting Standards Update 2016-02 $ in Millions	Dec. 30, 2018 USD ($)
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	$ 25
Forecast | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liabilities	25
Forecast | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	30
Operating lease, liabilities	$ 30