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Deferred Compensation Additional Information (Details) - USD ($)
$ in Millions
Jul. 31, 2016
Jan. 31, 2016
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Marketable securities $ 1,100.0  
Rabbi Trust Member    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Deferred compensation liability 45.6 $ 38.0
Deferred compensation liability current 2.1 1.9
Deferred compensation liability non-current $ 43.5 $ 36.1