Derivatives (Tables)

12 Months Ended

Sep. 30, 2018

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Details of Derivatives Held to Manage Foreign Currency Risk

The following table provides details of the derivatives held as of September 30, 2018 and 2017 to manage foreign currency risk.

		Notional Amount
Description	Borrowing	September 30, 2018	September 30, 2017	Hedge Designation
Cross Currency Swaps	3.4% Notes	USD 250 million swapped to EUR 223 million	USD 250 million swapped to EUR 223 million	Net investment
Forward Foreign Currency Contracts(1)	N/A	USD 18 million	USD 5 million	No designation

⁽¹⁾ Cabot’s forward foreign exchange contracts are denominated in the Indonesian rupiah and Czech koruna.

Summary Impact of Cross-currency Swaps to AOCI and Consolidated Statements of Operations

The following table summarizes the impact of the cross-currency swaps to AOCI and the Consolidated Statements of Operations:

	Years Ended September 30
	2018			2017			2016		2018			2017		2016		2018		2017		2016
Description	Gain/(Loss) Recognized in AOCI								(Gain)/Loss Reclassified from AOCI into Interest Expense in the Consolidated Statements of Operations							(Gain)/Loss Recognized in Interest Expense in the Consolidated Statements of Operations (Amount Excluded from Effectiveness Testing)
	(In millions)
Cross-currency swaps (1)	$	(2	)	$	(10	)	$	1	$	(5	)	$	—	$	—	$	2	$	—	$	—

⁽¹⁾ As noted above, effective October 1, 2017, the Company changed the method it uses to assess effectiveness from the method based on changes in forward exchange rates, in which all gains/losses were recognized in AOCI, to the method based on changes in spot exchange rates.