Income Taxes Reconciliation of Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jan. 01, 2015	Dec. 26, 2013	Dec. 27, 2012
Income Tax Disclosure [Abstract]
U.S Federal Statutory Rate (as a percent)	35.00%	35.00%	35.00%
Provision calculated at federal statutory income tax rate	$ 5.9	$ 4.9	$ 5.1
State and local income taxes, net of federal benefit	0.8	0.8	2.7
Total income tax provision	$ 6.7us-gaap_IncomeTaxExpenseBenefit	$ 5.7us-gaap_IncomeTaxExpenseBenefit	$ 7.8us-gaap_IncomeTaxExpenseBenefit

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6515339

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Name:	us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration