| Component: (Network and Table) | |
|---|---|
| Network | 092002 - Disclosure - FINANCIAL INFORMATION BY INDUSTRY SEGMENT, GEOGRAPHIC AREA AND PRODUCT LINE, REVENUE BY MAJOR CUSTOMERS (Details) (http://cabotcmp.com/role/FinancialInformationByIndustrySegmentGeographicAreaAndProductLineRevenueByMajorCustomersDetails) |
| Table | Schedule of Revenue by Major Customers, by Reporting Segments [Table] |
| Reporting Entity [Axis] | 0001102934 (http://www.sec.gov/CIK) |
| Revenue, Major Customer [Line Items] | Period [Axis] | ||||||||
|---|---|---|---|---|---|---|---|---|---|
2015-10-01 - 2016-09-30 | 2014-10-01 - 2015-09-30 | 2013-10-01 - 2014-09-30 | |||||||
| Geographical [Axis] | Geographical [Axis] | Geographical [Axis] | |||||||
| Taiwan [Member] | South Korea [Member] | China [Member] | Taiwan [Member] | South Korea [Member] | China [Member] | Taiwan [Member] | South Korea [Member] | China [Member] | |
Revenue | |||||||||