FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) $ in Thousands	Jun. 30, 2015 USD ($)
FAIR VALUE OF FINANCIAL INSTRUMENTS [Abstract]
Other long-term investments, Supplemental Employee Retirement Plan (SERP)	$ 1,855
Corresponding SERP liability	$ 1,855

Fair Value of long-term investments for the Supplemental Employee Retirement Plan (SERP) as of the balance sheet date.

No definition available.

Name:	ccmp_OtherLongTermInvestmentsSupplementalEmployeeRetirementPlanSerp
Namespace Prefix:	ccmp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant