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Employee Benefit Plans Percentage of Company Match of Employee Contriibution (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Savings Plan, Company Match of Employee Contribution 33.00%wmar_DefinedContributionSavingsPlanCompanyMatchOfEmployeeContribution    
Defined Benefit Plan, Contributions by Employer $ 0.6us-gaap_DefinedBenefitPlanContributionsByEmployer $ 0.6us-gaap_DefinedBenefitPlanContributionsByEmployer $ 0.6us-gaap_DefinedBenefitPlanContributionsByEmployer
Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Savings Plan, Employee Annual Compensation Match 5.00%wmar_DefinedContributionSavingsPlanEmployeeAnnualCompensationMatch
/ us-gaap_RangeAxis
= us-gaap_MaximumMember