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Commitments and Contingencies (Tables) | 6 Months Ended
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Mar. 31, 2016
Commitments And Contingencies Disclosure [Abstract] |
Schedule of Components of Purchase Commitments | Cabot has entered into long-term purchase agreements primarily for the purchase of raw materials. Under certain of these agreements the quantity of material being purchased is fixed, but the price paid changes as market prices change. For those commitments, the amounts included in the table below are based on market prices at March 31, 2016.
|  | Payments Due by Fiscal Year |
|  | Remainder of Fiscal 2016 |  |  | 2017 |  |  | 2018 |  |  | 2019 |  |  | 2020 |  |  | Thereafter |  |  | Total |
|  | (Dollars in millions) |
Reinforcement Materials |  | $ | 100 |  |  | $ | 128 |  |  | $ | 119 |  |  | $ | 116 |  |  | $ | 80 |  |  | $ | 1,446 |  |  | $ | 1,989 |
Performance Chemicals |  |  | 28 |  |  |  | 51 |  |  |  | 37 |  |  |  | 32 |  |  |  | 29 |  |  |  | 154 |  |  |  | 331 |
Purification Solutions |  |  | 5 |  |  |  | 7 |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 13 |
Total |  | $ | 133 |  |  | $ | 186 |  |  | $ | 157 |  |  | $ | 148 |  |  | $ | 109 |  |  | $ | 1,600 |  |  | $ | 2,333 |

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- Definition Tabular disclosure of key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount. + References No definition available. + Details
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