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Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2015
Feb. 01, 2014
Significant Accounting Policies [Line Items]    
Cash equivalents $ 3.1five_CashEquivalents $ 2.3five_CashEquivalents
Fair Value, Inputs, Level 1 [Member]    
Significant Accounting Policies [Line Items]    
Cash equivalents $ 43.1five_CashEquivalents
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 $ 2.3five_CashEquivalents
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member