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The Company and Significant Accounting Policies (Self-Insurance Liability) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Self Insurance Liability Rollforward [Roll Forward]      
Beginning balance $ 432.7us-gaap_SelfInsuranceReserve $ 480.1us-gaap_SelfInsuranceReserve $ 470.9us-gaap_SelfInsuranceReserve
Expense, including the effect of discount rate 153.9swy_SelfInsuranceExpense 98.6swy_SelfInsuranceExpense 151.6swy_SelfInsuranceExpense
Claim payments (151.2)swy_SelfinsuranceClaimPayments (137.2)swy_SelfinsuranceClaimPayments (142.5)swy_SelfinsuranceClaimPayments
Disposal of discontinued operations 0swy_SelfinsuranceDisposalofDiscontinuedOperations (8.8)swy_SelfinsuranceDisposalofDiscontinuedOperations 0swy_SelfinsuranceDisposalofDiscontinuedOperations
Currency translation 0swy_SelfinsuranceCurrencyTranslationAdjustment 0swy_SelfinsuranceCurrencyTranslationAdjustment 0.1swy_SelfinsuranceCurrencyTranslationAdjustment
Reclass insurance recoveries to receivable 25.2swy_SelfInsuranceReclassifications 0swy_SelfInsuranceReclassifications 0swy_SelfInsuranceReclassifications
Ending balance 460.6us-gaap_SelfInsuranceReserve 432.7us-gaap_SelfInsuranceReserve 480.1us-gaap_SelfInsuranceReserve
Less current portion (113.3)us-gaap_SelfInsuranceReserveCurrent (108.6)us-gaap_SelfInsuranceReserveCurrent (137.4)us-gaap_SelfInsuranceReserveCurrent
Long-term portion 347.3us-gaap_SelfInsuranceReserveNoncurrent 324.1us-gaap_SelfInsuranceReserveNoncurrent 342.7us-gaap_SelfInsuranceReserveNoncurrent
Self insurance, undiscounted liability $ 477.4swy_SelfInsuranceReserveUndiscounted $ 477.2swy_SelfInsuranceReserveUndiscounted