XML 84 R67.htm IDEA: XBRL DOCUMENT
v3.23.3

Derivatives - Details of Derivatives Held to Manage Foreign Currency Risk (Detail) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 EUR (€) | Sep. 30, 2022 USD ($) | Sep. 30, 2022 EUR (€) | Sep. 30, 2016
--- | --- | --- | --- | --- | ---
3.4% Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate on borrowing |  | 3.40% | 3.40% | 3.40% | 3.40% |
3.4% Notes [Member] | Fixed Rate Debt [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate on borrowing |  |  |  |  |  | 3.40%
Net Investment Hedge [Member] | 3.4% Notes [Member] | Cross Currency Swaps [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount |  | $ 250,000,000 | € 223,000,000 | $ 250,000,000 | € 223,000,000 |
Net Investment Hedge [Member] | 3.4% Notes [Member] | Fixed Rate Debt [Member] | Cross Currency Swaps [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate on borrowing |  | 3.40% | 3.40% | 3.40% | 3.40% |
Not Designated as Hedging Instrument [Member] | Forward Foreign Currency Contracts [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | [1] | $ 82,000,000 |  | $ 42,000,000 |  |
[1] | At September 30, 2023, the Company’s forward foreign exchange contracts were denominated in Indonesian rupiah, Czech koruna, and Colombian peso. At September 30, 2022, the Company’s forward foreign exchange contracts were denominated in Indonesian rupiah and Czech koruna.

X
- Definition Derivative notional amount lower buying higher selling of foreign exchange. + References No definition available. + Details
Name: | cbt_DerivativeNotionalAmountLowerBuyingHigherSellingOfForeignExchange
Namespace Prefix: | cbt_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-5 + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cbt_ThreePointFourPercentageNotesDueTwoThousandAndTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=cbt_FixedRateDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_NetInvestmentHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CrossCurrencyInterestRateContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ForwardContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |