Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Jun. 29, 2019	Dec. 30, 2018	Dec. 29, 2018
Finance leases:
Property and equipment - gross	$ 9.1
Accumulated depreciation and amortization	(0.7)
Property and equipment - net	8.4	$ 7.8	$ 7.8
Other accrued liabilities	1.5	1.2	1.2
Other long-term liabilities	7.1	6.6	6.6
Total finance lease liabilities	8.6
Operating leases:
Operating lease right-of-use assets	55.4	60.5	$ 0.0
Other accrued liabilities	20.8	20.2
Operating lease liabilities	35.7	$ 40.4
Total operating lease liabilities	$ 56.5