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Organization and Basis of Presentation - Additional Information (Detail)
Nov. 22, 2013
GeographicMarket
Vendor
Country
Sep. 30, 2018
Pension_Plan
Basis Of Presentation And Organization [Line Items]    
Number of geographical area covered | GeographicMarket 80  
Number of vendors | Vendor 1,000  
Number of countries distribution occur through vendors | Country 40  
UK [Member]    
Basis Of Presentation And Organization [Line Items]    
Number of defined benefit plan | Pension_Plan   2