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Blackhawk - Acquisition (Details) (Blackhawk Network Holdings, Inc. [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended
Nov. 29, 2013
Nov. 12, 2013
Retailo [Member]    
Business Acquisition [Line Items]    
Percent of common stock acquired 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= swy_RetailoMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Purchase consideration $ 70.2us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= swy_RetailoMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
InteliSpend [Member]    
Business Acquisition [Line Items]    
Purchase consideration   $ 97.5us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= swy_InteliSpendMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember