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Hyperinflationary Economies - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
$ / $
Jun. 30, 2019
USD ($)
$ / $
Sep. 30, 2018
Argentina [Member]      
Schedule Of Equity Method Investments [Line Items]      
Percentage of net revenue 2.00% 3.00%  
Foreign currency exchange rate, translation | $ / $ 42.7 42.7  
Argentina [Member] | Other Income (Expense) [Member]      
Schedule Of Equity Method Investments [Line Items]      
Foreign currency exchange gains or (losses)   $ (1,000,000)  
Argentina [Member] | Maximum [Member]      
Schedule Of Equity Method Investments [Line Items]      
Percentage of assets and liabilities current   2.00% 2.00%
Argentina [Member] | Maximum [Member] | Other Income (Expense) [Member]      
Schedule Of Equity Method Investments [Line Items]      
Foreign currency exchange gains or (losses) $ 1,000,000    
Venezuela [Member] | Carbon Black Affiliate [Member]      
Schedule Of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 49.00% 49.00%  
Venezuela [Member] | Other Income (Expense) [Member] | Carbon Black Affiliate [Member]      
Schedule Of Equity Method Investments [Line Items]      
Impairment charge $ 11,000,000    
Carbon Black Operating Entity [Member] | Argentina [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership percentage 100.00% 100.00%