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Acquisition - Cash Purchase Price (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Business Acquisition [Line Items]
Goodwill	$ 47,772	$ 0
Cedar Creek
Business Acquisition [Line Items]
Cash and net working capital assets (excluding inventory)	88,318
Inventory	159,227
Property and equipment	71,203
Other, net	(1,395)
Goodwill	47,772
Capital leases and other liabilities	(44,753)
Cash purchase price	361,752
Customer relationships | Cedar Creek
Business Acquisition [Line Items]
Intangible assets	25,500
Non-compete agreements | Cedar Creek
Business Acquisition [Line Items]
Intangible assets	8,254
Trade names | Cedar Creek
Business Acquisition [Line Items]
Intangible assets	6,826
Favorable leasehold interests | Cedar Creek
Business Acquisition [Line Items]
Intangible assets	$ 800

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