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Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) (Fair Value, Inputs, Level 1 [Member], USD $)
In Millions, unless otherwise specified
May 02, 2015
Jan. 31, 2015
May 03, 2014
Fair Value, Inputs, Level 1 [Member]
      
Significant Accounting Policies [Line Items]      
Cash equivalents $ 43.9five_CashEquivalents
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 $ 43.1five_CashEquivalents
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 $ 3.1five_CashEquivalents
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member