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Investments in Affiliates - Additional Information (Detail)
€ in Millions, $ in Millions
3 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Sep. 30, 2018
European Joint Venture      
Investments In And Advances To Affiliates [Line Items]      
Investment ownership percentage     33.00%
European Joint Venture Partners | Scenario Forecast      
Investments In And Advances To Affiliates [Line Items]      
Proceeds from sale of interest in joint venture $ 505 € 435