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Earnings Per Share - Components of Basic and Diluted Earnings Per Common Share (EPS) (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Basic EPS:      
Net income (loss) attributable to Cabot Corporation $ 380 $ 445 $ 209
Less: Dividends and dividend equivalents to participating securities 1 1 1
Less: Undistributed earnings allocated to participating securities 5 7 2
Earnings (loss) allocated to common shareholders (numerator) $ 374 $ 437 $ 206
Weighted average common shares and participating securities outstanding 56.0 57.3 57.4
Less: Participating securities 0.9 1.2 0.9
Adjusted weighted average common shares (denominator) 55.1 56.1 56.5
Basic $ 6.79 $ 7.79 $ 3.65
Diluted EPS:      
Earnings (loss) allocated to common shareholders $ 374 $ 437 $ 206
Plus: Earnings allocated to participating securities 6 8 3
Less: Adjusted earnings allocated to participating securities 6 8 3
Earnings (loss) available to common shares (numerator) $ 374 $ 437 $ 206
Adjusted weighted average common shares outstanding 55.1 56.1 56.5
Common shares issuable 0.6 0.4 0.4
Adjusted weighted average common shares (denominator) 55.7 56.5 56.9
Diluted $ 6.72 $ 7.73 $ 3.62