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Venezuela - Additional Information (Detail) VEF in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) VEB / $ | Mar. 31, 2016 USD ($) VEB / $ | Mar. 31, 2015 USD ($) | Mar. 31, 2016 VEF VEB / $ | Dec. 31, 2015 VEB / $
Nature Of Operations [Line Items] |  |  |  |  |
Operating affiliate investment | $ 13,000,000 | $ 13,000,000 |  |  |
Due from affiliates, dividends cash | VEF |  |  |  | VEF 16 |
Conversion of Bolivars to USD | VEB / $ | 270 | 270 |  | 270 | 52
Subsidiaries |  |  |  |  |
Nature Of Operations [Line Items] |  |  |  |  |
Cash dividends received from subsidiary |  | $ 2,000,000 | $ 4,000,000 |  |
Maximum [Member] |  |  |  |  |
Nature Of Operations [Line Items] |  |  |  |  |
Due from affiliates, dividends cash | $ 1,000,000 | $ 1,000,000 |  |  |
Net gain on exchange rate devaluation | $ 1,000,000 |  |  |  |
Venezuela [Member] | Carbon Black Affiliate [Member] |  |  |  |  |
Nature Of Operations [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 49.00% | 49.00% |  | 49.00% |

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