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Earnings Per Share - Components of Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Basic EPS:
Net income attributable to Cabot Corporation	$ 48	$ 26	$ 41	$ 71
Earnings allocated to common shareholders (numerator)	$ 48	$ 26	$ 41	$ 71
Weighted average common shares and participating securities outstanding	62.9	64.1	62.9	64.4
Less: Participating securities	0.5	0.5	0.5	0.5
Adjusted weighted average common shares (denominator)	62.4	63.6	62.4	63.9
Net income attributable to Cabot Corporation	$ 0.76	$ 0.41	$ 0.65	$ 1.11
Diluted EPS:
Earnings allocated to common shareholders	$ 48	$ 26	$ 41	$ 71
Earnings allocated to common shareholders (numerator)	$ 48	$ 26	$ 41	$ 71
Adjusted weighted average common shares (denominator)	62.4	63.6	62.4	63.9
Common shares issuable	0.4	0.5	0.5	0.5
Adjusted weighted average common shares (denominator)	62.8	64.1	62.9	64.4
Net income attributable to Cabot Corporation	$ 0.76	$ 0.41	$ 0.65	$ 1.10

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