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Subsequent Event	12 Months Ended
Subsequent Event	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Event	Note U. Subsequent Event In November 2017, Cabot purchased Tech Blend, a leading North American producer of black masterbatch, for approximately $64 million in cash. Goodwill is expected to be generated from the acquisition, which will not be deductible for tax purposes. Tech Blend produces black masterbatches (also known as concentrates) for applications in the automotive, infrastructure and agricultural industries at its manufacturing facility in Saint-Jean-sur-Richelieu, Québec, Canada. The acquisition extends Cabot’s global footprint in black masterbatch and compounds and provides a platform to serve global customers and grow in conductive formulations.