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Assets Held for Sale (Details) $ in Thousands	12 Months Ended
	Dec. 30, 2017 USD ($) warehouse property	Dec. 31, 2016 USD ($) property	Jan. 02, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held for sale | property	2	4
Number of properties sold | property	2
Gains from sales of property | $	$ 6,700	$ 28,097	$ 0
Discontinued operations, held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net book value of total assets held for sale | $	$ 800	$ 2,700
Lubbock, Texas
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held for sale | warehouse	1

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Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 10
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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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