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Deferred Compensation - Additional Information (Detail) - USD ($)
$ in Millions
Jan. 31, 2017
Jan. 31, 2016
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Marketable securities $ 993.0  
Rabbi Trust    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Deferred compensation liability current 3.1 $ 1.9
Deferred compensation liability non-current 44.2 36.1
Marketable Securities, Current    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Trading securities 47.3 38.0
Marketable Securities, Current | Rabbi Trust    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Trading securities $ 47.3 $ 38.0