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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 30, 2017 | Dec. 31, 2016 | Dec. 26, 2015 | Mar. 01, 2014
Significant Accounting Policies [Line Items] |  |  |  |  |
Fiscal Period Duration |  | 364 days | 371 days | 364 days |
Cash Equivalents, at Carrying Value | $ 714 | $ 341 | $ 714 |  |
Allowance for Doubtful Accounts Receivable | 1,455 | 1,946 | 1,455 |  |
Impairment of Long-Lived Assets Held-for-use | 894 | $ 0 | 894 | $ 0 |
Closed stores, remaining lease term |  | 8 months |  |  |
Closed store lease liabilities | 105 | $ 39 | 105 |  |
Self Insurance, Maximum of Workers Compensation Claims Liability per Associate per Claim |  | 2,000 |  |  |
Stop loss insurance specific deductible |  |  |  |  | $ 500
Stop loss insurance aggregating deductible |  |  |  |  | $ 250
Cost of Goods Sold, Vendor Allowances |  | 114,100 | 123,900 | 97,000 |
Vendor Paid Cooperative Advertising Credits |  | 19,200 | 19,100 | 17,100 |
Accounts Receivable, Earned Advertising Credits | 852 | 1,000 | 852 |  |
Accounts Receivable, Earned Promotional Discounts | 10,700 | 13,100 | 10,700 |  |
Unearned Income for Vendor Programs | $ 4,000 | 9,800 | 4,000 |  |
Advertising Expense |  | 31,000 | $ 26,300 | $ 23,100 |
Between March 1, 2013 to March 1, 2014 [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Self Insurance, Annual Maximum of Health Claims Liability per Associate |  | 2,000 |  |  |
Maximum [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property and Casualty Insurance, Deductible |  | 1,000 |  |  |
Minimum [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property and Casualty Insurance, Deductible |  | $ 100 |  |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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