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Fair Value Measurements (Details) - USD ($)
$ in Millions
Apr. 30, 2016
Jan. 30, 2016
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Securities, Fair Value Disclosure $ 21.7 $ 17.3