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Venezuela - Additional Information (Detail)
VEF in Millions
9 Months Ended
Jun. 30, 2015
USD ($)
VEB / $
Jun. 30, 2014
USD ($)
Jun. 30, 2015
VEF
VEB / $
Nature Of Operations [Line Items]      
Operating affiliate investment $ 15,000,000    
Due from affiliates, dividends cash | VEF     VEF 18
Conversion of Bolivars to USD | VEB / $ 52   52
Subsidiaries [Member]      
Nature Of Operations [Line Items]      
Cash dividend received from subsidiary $ 5,000,000 $ 4,000,000  
Maximum [Member]      
Nature Of Operations [Line Items]      
Due from affiliates, dividends cash $ 1,000,000    
Carbon Black Affiliate [Member] | Venezuela [Member]      
Nature Of Operations [Line Items]      
Equity method investment, ownership percentage 49.00%   49.00%