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Deferred Compensation - Additional Information (Detail) - USD ($)
$ in Millions
Jan. 31, 2016
Jan. 31, 2015
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Marketable securities $ 1,430.2  
Rabbi Trust    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Deferred compensation liability current 1.9 $ 5.3
Deferred compensation liability non-current 36.1 35.0
Marketable Securities, Current    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Trading securities 38.0 40.3
Marketable Securities, Current | Rabbi Trust    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Trading securities $ 38.0 $ 40.3