Rendering

Component: (Network and Table)
Network
100810 - Disclosure - Employee Benefit Plans - Estimated Future Benefit Payments (Detail)
(http://www.cabot-corp.com/20160930/taxonomy/role/DisclosureEmployeeBenefitPlansEstimatedFutureBenefitPaymentsDetail)
TableSchedule Of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000016040 (http://www.sec.gov/CIK)
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2016-09-30
Defined Benefit Plans and Other Postretirement Benefit Plans
U.S. Pension Benefits [Member]Foreign Pension Benefits [Member]U. S. Postretirement Benefits [Member]Foreign Postretirement Benefits [Member]
2017
13,000,000  
12,000,000  
4,000,000  
 
2018
11,000,000  
13,000,000  
3,000,000  
1,000,000  
2019
11,000,000  
12,000,000  
3,000,000  
1,000,000  
2020
11,000,000  
12,000,000  
3,000,000  
1,000,000  
2021
11,000,000  
14,000,000  
3,000,000  
1,000,000  
2022-2026
52,000,000  
80,000,000  
13,000,000  
4,000,000