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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employees maximum annual contribution (percent) 50.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
Cost recognized under defined contribution plans $ 1.0us-gaap_DefinedContributionPlanCostRecognized $ 1.0us-gaap_DefinedContributionPlanCostRecognized $ 0.8us-gaap_DefinedContributionPlanCostRecognized
Maximum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer matching contribution, (percent) 1.50%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember