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Summary of Significant Accounting Policies Foreign Currency (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Accounting Policies [Abstract]      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, SG&A Portion $ (0.5)wmar_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentSgAndPortion $ (0.6)wmar_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentSgAndPortion $ 0.1wmar_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentSgAndPortion