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Derivatives - Details of Derivatives Held to Manage Foreign Currency Risk (Detail) - USD ($)		Mar. 31, 2016	Sep. 30, 2015
Not Designated as Hedging Instrument [Member] | Forward Foreign Currency Contracts [Member]
Derivative [Line Items]
Notional amount, net of forward foreign currency contract no designation hedge derivatives	[1]	$ 3,000,000	$ 2,000,000
[1] Cabot’s forward foreign exchange contracts are denominated primarily in the British pound sterling, Czech koruna, and Indonesian rupiah.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Period Type:	instant

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- 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

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: