Debt - Letters of Credit (Details) (Letter of Credit [Member], USD $)
May 02, 2015
Jan. 31, 2015
Trade LCs [Member]
   
Debt Instrument [Line Items]    
Letters of credit outstanding $ 0 $ 0
Stand-by LCs [Member]
   
Debt Instrument [Line Items]    
Letters of credit outstanding $ 2,500,000 $ 2,500,000