Leases - Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 30, 2018	Dec. 29, 2018
Assets:
Operating lease assets	$ 375,650	$ 388,811	$ 0
Finance lease assets	5,708
Total lease assets	381,358
Current:
Operating lease liabilities	35,822	33,822	0
Finance lease liabilities	587
Long-term:
Operating lease liabilities	384,671	$ 401,249	0
Finance lease liabilities	7,236
Total lease liabilities	428,316
Accumulated depreciation	$ 3,700		5,000
Capital Lease Obligations [Abstract]
Property, equipment, and software, net			5,264
Other current liabilities			476
Other long-term liabilities			6,998
Total lease liabilities			$ 7,474