Debt (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 25, 2012	Mar. 26, 2013 Revolving Facility ($100 million) [Member]	Mar. 26, 2013 Old Revolving Credit Facility [Member]	Dec. 25, 2012 Old Revolving Credit Facility [Member]
Debt (Textual) [Abstract]
Borrowing capacity available under our revolving line of credit			$ 81.4	$ 81.1
Outstanding letters of credit		18.6		18.9
Extinguishment of Debt, Amount	$ 5.0
Credit Agreement Period	95 days

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant