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Commitments and Contingencies (Narrative) (Details) (USD $)
 12 Months Ended 2 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Mar. 26, 2015
lease
Commitments and Contingencies [Line Items]        
Lease renewal period, minimum (years) 5 years      
Operating lease agreement extension term (years) 10 years      
Operating lease agreement expiration period 2024      
Rent expense $ 53,600,000us-gaap_OperatingLeasesRentExpenseNet $ 41,800,000us-gaap_OperatingLeasesRentExpenseNet $ 32,800,000us-gaap_OperatingLeasesRentExpenseNet  
Contingent rents 500,000us-gaap_OperatingLeasesRentExpenseContingentRentals 500,000us-gaap_OperatingLeasesRentExpenseContingentRentals 500,000us-gaap_OperatingLeasesRentExpenseContingentRentals  
Operating Leases, Future Minimum Payments Due 539,611,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue      
Purchase commitments 2,900,000us-gaap_LongTermPurchaseCommitmentAmount      
Subsequent Event [Member]        
Commitments and Contingencies [Line Items]        
Number Of Leases       10five_NumberOfLeases
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Average Lease Term Period       10 years
Operating Leases, Future Minimum Payments Due       24,200,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Key Employees [Member]        
Commitments and Contingencies [Line Items]        
Maximum additional payments upon employee separation $ 5,700,000us-gaap_SeveranceCosts1
/ us-gaap_TitleOfIndividualAxis
= five_KeyEmployeesMember