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Venezuela - Additional Information (Detail) $ in Millions	9 Months Ended
Venezuela - Additional Information (Detail) $ in Millions	Jun. 30, 2018 USD ($) Bs. / $	Jun. 30, 2017 USD ($)	Sep. 30, 2017 Bs. / $
Schedule Of Equity Method Investments [Line Items]
Operating affiliate investment	$ 13
Conversion of Bolivars to USD \| Bs. / $	96,000		3,345
Subsidiaries
Schedule Of Equity Method Investments [Line Items]
Cash dividends received from subsidiary	$ 3	$ 3
Venezuela [Member] \| Carbon Black Affiliate [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%