XML 64 R51.htm IDEA: XBRL DOCUMENT v3.7.0.1
Deferred Compensation Additional Information (Details) - USD ($)
$ in Millions
Jul. 31, 2017
Jan. 31, 2017
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Marketable securities $ 769.6  
Rabbi Trust Member    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Deferred compensation liability 54.4 $ 47.3
Deferred compensation liability current 3.0 3.1
Deferred compensation liability non-current $ 51.4 $ 44.2