Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2013 WK	Dec. 30, 2012 WK	Dec. 25, 2011 WK
Significant accounting policies
Period in arrears to consolidate operations	1 month
Number of weeks in fiscal year	52	53	52
International
Significant accounting policies
Incremental change in revenues due to change in consolidation policy	$ 2,100
Incremental change in loss before income taxes due to change in consolidation policy	$ 215