Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014	Mar. 01, 2014
Fiscal Period Duration		371 days	364 days	364 days
Cash Equivalents, at Carrying Value	$ 714	$ 714	$ 7,700
Allowance for Doubtful Accounts Receivable	1,455	1,455	1,967
Impairment of Long-Lived Assets Held-for-use	894	894	0	$ 0
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		123,900	97,000	89,500
Vendor Paid Cooperative Advertising Credits		19,100	17,100	16,000
Accounts Receivable, Earned Advertising Credits	852	852	842
Accounts Receivable, Earned Promotional Discounts	10,700	10,700	8,100
Unearned Income for Vendor Programs	$ 4,000	4,000	823
Advertising Expense		26,300	$ 23,100	$ 24,600
Between March 1, 2013 to March 1, 2014 [Member]
Self Insurance, Annual Maximum of Health Claims Liability per Associate		2,000
Maximum [Member]
Property and Casualty Insurance, Deductible		1,000
Minimum [Member]
Property and Casualty Insurance, Deductible		$ 100