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Subsequent Event | 9 Months Ended
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Jun. 30, 2018
Subsequent Events [Abstract] |
Subsequent Event | Q. Subsequent Event Cabot owns 100% of a carbon black operating entity in Argentina. Due to recent negative economic trends in Argentina, including multiple periods of increasing inflation rates, devaluation of the Argentine peso, and increasing borrowing rates locally, the cumulative three-year inflation rate for the country exceeds 100%, and is expected to exceed 100% for the foreseeable future. Therefore, the operating entity is considered to be functioning in a highly inflationary economy, and will begin using Cabot’s reporting currency, the U.S. dollar, as its functional currency as of July 1, 2018. No financial statement impact is expected at the date of conversion as a result of the change in functional currency. Income from operations is not expected to be significantly impacted from this change since the operating entity’s sales and a portion of its raw material purchases are denominated in U.S. dollars. However, any future change in the Argentine peso exchange rate will result in foreign currency exchange gains or losses on the operating entity’s peso-denominated monetary assets and liabilities.

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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -URI http://asc.fasb.org/topic&trid=2122774 + Details
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