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Income Taxes Valuation Allowance (Details) (USD $)
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Income Tax Contingency [Line Items]        
Deferred Tax Assets, Valuation Allowance $ 23,579,000us-gaap_DeferredTaxAssetsValuationAllowance $ 22,494,000us-gaap_DeferredTaxAssetsValuationAllowance    
Valuation Allowances and Reserves, Balance 6,807,000us-gaap_ValuationAllowancesAndReservesBalance 3,884,000us-gaap_ValuationAllowancesAndReservesBalance 1,692,000us-gaap_ValuationAllowancesAndReservesBalance 1,692,000us-gaap_ValuationAllowancesAndReservesBalance
Valuation Allowances and Reserves, Recoveries 2,923,000us-gaap_ValuationAllowancesAndReservesRecoveries [1] 2,552,000us-gaap_ValuationAllowancesAndReservesRecoveries [1] 0us-gaap_ValuationAllowancesAndReservesRecoveries  
Valuation Allowances and Reserves, Deductions 0us-gaap_ValuationAllowancesAndReservesDeductions (360,000)us-gaap_ValuationAllowancesAndReservesDeductions [2] 0us-gaap_ValuationAllowancesAndReservesDeductions [2]  
CA EZ tax credits [Member]        
Income Tax Contingency [Line Items]        
Valuation Allowances and Reserves, Period Increase (Decrease) 1,100,000us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease
/ us-gaap_RangeAxis
= wmar_CAEZtaxcreditsMember
     
Valuation Allowances and Reserves, Adjustments $ 2,800,000us-gaap_ValuationAllowancesAndReservesAdjustments
/ us-gaap_RangeAxis
= wmar_CAEZtaxcreditsMember
     
[1] Represents additional valuation allowance against California enterprise zone tax credits for deferred tax allowance of $1.1 million plus additional valuation allowance against Canadian deferred tax assets of $0.8 million.
[2] Represents reduction of state valuation allowance against tax credits.