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Capital Stock (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended 36 Months Ended
Jun. 14, 2014
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Jan. 03, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Preferred stock, shares authorized   25,000,000us-gaap_PreferredStockSharesAuthorized     25,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares outstanding   0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, shares authorized   1,500,000,000us-gaap_CommonStockSharesAuthorized 1,500,000,000us-gaap_CommonStockSharesAuthorized   1,500,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value (usd per share)   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare   0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock shares outstanding, net of treasury stock   231,400,000us-gaap_CommonStockSharesOutstanding 230,100,000us-gaap_CommonStockSharesOutstanding   231,400,000us-gaap_CommonStockSharesOutstanding
Treasury stock, shares   14,400,000us-gaap_TreasuryStockShares 14,100,000us-gaap_TreasuryStockShares   14,400,000us-gaap_TreasuryStockShares
Repurchased shares   0us-gaap_TreasuryStockSharesAcquired 19,500,000us-gaap_TreasuryStockSharesAcquired 57,600,000us-gaap_TreasuryStockSharesAcquired  
Average cost of repurchased shares (usd per share)     $ 33.93us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 21.51us-gaap_TreasuryStockAcquiredAverageCostPerShare  
Repurchased shares, value     $ 663.7us-gaap_TreasuryStockValueAcquiredCostMethod $ 1,240.3us-gaap_TreasuryStockValueAcquiredCostMethod  
Repurchased stock retired   0us-gaap_TreasuryStockSharesRetired 371,600,000us-gaap_TreasuryStockSharesRetired 0us-gaap_TreasuryStockSharesRetired  
Share-based compensation expense (credit)   24.7us-gaap_AllocatedShareBasedCompensationExpense 50.4us-gaap_AllocatedShareBasedCompensationExpense 48.4us-gaap_AllocatedShareBasedCompensationExpense  
Total intrinsic value of stock options exercised   30.7us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 47.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 0.7us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue  
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation costs on nonvested awards   25.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
    25.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Nonvested awards weighted average period of recognition   2 years 4 months 6 days      
Stock Options [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   4 years      
Share based payment award contractual term   6 years      
Stock Options [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   5 years      
Share based payment award contractual term   10 years      
Stock Options [Member] | 1999 Amended and Restated Equity Participation Plan [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based payment award contractual term   6 years      
Stock Options [Member] | 1999 Amended and Restated Equity Participation Plan [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based payment award contractual term   10 years      
Stock Options [Member] | 2007 Equity and Incentive Award Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards available for grant (in shares)   8,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= swy_EquityAndIncentiveAwardPlan2007Member
    8,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= swy_EquityAndIncentiveAwardPlan2007Member
Stock Options [Member] | 2011 Equity and Incentive Award Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards available for grant (in shares)   6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= swy_EquityAndIncentiveAwardPlan2011Member
    6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= swy_EquityAndIncentiveAwardPlan2011Member
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards granted (in shares)   748,611us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
747,708us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
695,816us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Share-based compensation expense (credit)   25.5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
15.8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
13.1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Restricted stock awarded (value)   28.7us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
16.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
14.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Unrecognized compensation costs on nonvested awards   52.9us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
    52.9us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Nonvested awards weighted average period of recognition   2 years 8 months 23 days      
Restricted Stock [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   3 years      
Restricted Stock [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   5 years      
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   3 years      
Awards granted (in shares)         2,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Share-based compensation expense (credit) $ (18.8)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
$ 3.5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
$ 14.9us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
$ 9.8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Vesting Period 1 [Member] | Stock Options [Member] | 1999 Amended and Restated Equity Participation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   4 years      
Vesting Period 2 [Member] | Stock Options [Member] | 1999 Amended and Restated Equity Participation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   5 years      
Vesting Period 3 [Member] | Stock Options [Member] | 1999 Amended and Restated Equity Participation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   7 years