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Shareholders' Equity (Deficit) (Common Stock) (Details) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended
Jul. 01, 2013
Feb. 04, 2013
Jul. 24, 2012
Jul. 17, 2012
Mar. 31, 2012
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Sep. 23, 2013
Sep. 27, 2012
Class of Stock [Line Items]                    
Options cancelled (shares)         2,020,620five_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriod 20,000five_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriod 35,300five_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriod 2,020,620five_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriod    
Percentage of shares vested (percent)           33.00%five_RestrictedStockUnitsTermsPercentageOfSharesToVest 33.00%five_RestrictedStockUnitsTermsPercentageOfSharesToVest 33.00%five_RestrictedStockUnitsTermsPercentageOfSharesToVest    
Compensation expense         $ 17,400,000us-gaap_AllocatedShareBasedCompensationExpense $ 16,400us-gaap_AllocatedShareBasedCompensationExpense $ 13,500us-gaap_AllocatedShareBasedCompensationExpense      
Expenses on date of modification         5,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost 5,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost        
Stock options vesting period from the date of grant (years)         2 years          
Fair value warrant to purchase common stock               43,000us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued    
Proceeds from issuance of common stock           200,000us-gaap_ProceedsFromIssuanceOfCommonStock 100,000us-gaap_ProceedsFromIssuanceOfCommonStock      
Reverse stock split ratio       0.3460five_ReverseStockSplitRatio            
Common stock, shares authorized       120,000,000us-gaap_CommonStockSharesAuthorized   120,000,000us-gaap_CommonStockSharesAuthorized 120,000,000us-gaap_CommonStockSharesAuthorized      
Preferred stock dividend, percentage       8.00%us-gaap_PreferredStockDividendRatePercentage       8.00%us-gaap_PreferredStockDividendRatePercentage    
Initial public offering shares (shares)     11,057,692five_InitialPublicOfferingShares              
Initial public offering shares price per share (dollars per share)     $ 17.00five_InitialPublicOfferingPricePerShare              
Net proceeds from issuance of initial public offering after deducting underwriting discounts and commissions and offering costs     73,200,000five_NetProceedsFromIssuanceOfInitialPublicOfferingAfterDeductingUnderwritingDiscountsAndCommissionsAndOfferingCosts              
Underwriters discount and legal, accounting, and other expenses     8,500,000five_UnderwritersDiscountAndCommissionPaidOnInitialPublicOffering              
Repayment of Term Loan Facility     65,300,000us-gaap_RepaymentsOfSecuredDebt     19,500,000us-gaap_RepaymentsOfSecuredDebt 15,000,000us-gaap_RepaymentsOfSecuredDebt 65,500,000us-gaap_RepaymentsOfSecuredDebt    
Interest expense     700,000us-gaap_InterestExpense              
Number of shares of common stock reserved for issuance (shares)                   500,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Discount on common stock fair value for employee purchases (percent)                   10.00%five_DiscountOnCommonStockFairValueForEmployeePurchases
Stock Issued During Period, Shares, Employee Stock Purchase Plans           179,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 148,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans      
Secondary stock offering 6,900,000five_SecondaryStockOffering 13,012,250five_SecondaryStockOffering             7,100,000five_SecondaryStockOffering  
Secondary Offering Price Per Share $ 36.00five_SecondaryOfferingPricePerShare $ 35.65five_SecondaryOfferingPricePerShare             $ 46.65five_SecondaryOfferingPricePerShare  
Stock Offering Expenses $ 1,000,000five_StockOfferingExpenses $ 1,000,000five_StockOfferingExpenses                
IPO [Member]                    
Class of Stock [Line Items]                    
Initial public offering shares (shares)     4,807,692five_InitialPublicOfferingShares
/ five_CommonEquityOfferingProgramAxis
= us-gaap_IPOMember		              
Shares Sold By Stockholders [Member]                    
Class of Stock [Line Items]                    
Initial public offering shares (shares)     6,250,000five_InitialPublicOfferingShares
/ five_CommonEquityOfferingProgramAxis
= five_SharesSoldByStockholdersMember		              
Underwriters [Member]                    
Class of Stock [Line Items]                    
Initial public offering shares (shares)     1,442,308five_InitialPublicOfferingShares
/ five_CommonEquityOfferingProgramAxis
= five_UnderwritersMember		              
Common stock [Member]                    
Class of Stock [Line Items]                    
Stock Issued During Period, Shares, Employee Stock Purchase Plans           4,345us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 3,565us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Performance Based Vesting Schedule [Member]                    
Class of Stock [Line Items]                    
Options cancelled (shares)         1,010,310five_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriod
/ us-gaap_PlanNameAxis
= five_PerformanceBasedVestingScheduleMember		     1,010,310five_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriod
/ us-gaap_PlanNameAxis
= five_PerformanceBasedVestingScheduleMember