| Label | Element | Value |
|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |
| Document Type | dei_DocumentType | 497 |
| Document Period End Date | dei_DocumentPeriodEndDate | Jun. 30, 2019 |
| Registrant Name | dei_EntityRegistrantName | NORTH CAROLINA CAPITAL MANAGEMENT TRUST |
| Central Index Key | dei_EntityCentralIndexKey | 0000702149 |
| Investment Company Type | dei_EntityInvCompanyType | N-1A |
| Amendment Flag | dei_AmendmentFlag | false |
| Document Creation Date | dei_DocumentCreationDate | Jul. 08, 2020 |
| Document Effective Date | dei_DocumentEffectiveDate | Jul. 08, 2020 |
| Prospectus Date | rr_ProspectusDate | Aug. 29, 2019 |