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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName NORTH CAROLINA CAPITAL MANAGEMENT TRUST
Prospectus Date rr_ProspectusDate Aug. 29, 2015
Retail | Term Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary

Fund:
Term Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to obtain as high a level of current income as is consistent with the preservation of capital.
Expense [Heading] rr_ExpenseHeading Fee Table
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees
(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual operating expenses
(expenses that you pay each year as a % of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 902% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 902.00%
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Normally investing in obligations of the U.S. Government, its agencies or instrumentalities, obligations fully guaranteed by the U.S. Government, or obligations of the State of North Carolina, bonds and notes of any North Carolina local government or public authority, and high-grade money market instruments, as permitted pursuant to North Carolina General Statute 159-30, as amended (the Statute) and 20 North Carolina Administrative Code 3.0703, as amended (the Code).
  • Investing in securities rated in the three highest categories by at least one nationally recognized rating service, or, if unrated, determined to be of equivalent quality.
  • Managing the fund to have similar overall interest rate risk to the Barclays® U.S. 3-6 Month Treasury Bill Index.
  • Allocating assets across different market sectors and maturities.
  • Investing more than 25% of total assets in the financial services industries.
  • Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration
  • Financial Services Concentration. Changes in government regulation and interest rates and economic downturns can have a significant negative effect on issuers in the financial services sector, including the price of their securities or their ability to meet their payment obligations.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
  • Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
  • Foreign Exposure. Entities located in foreign countries can be affected by adverse political, regulatory, market, or economic developments in those countries.
  • Financial Services Concentration. Changes in government regulation and interest rates and economic downturns can have a significant negative effect on issuers in the financial services sector, including the price of their securities or their ability to meet their payment obligations.
  • Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.
  • Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease.
An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate. You could lose money by investing in the fund.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. The index description appears in the Additional Index Information section of the prospectus. Prior to November 1, 2010, the fund operated under certain different investment policies and, prior to August 1, 2011, compared its performance to a different benchmark. The fund's historical performance may not represent its current investment policies. Past performance is not an indication of future performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance is not an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading Year-by-Year Returns
Calendar Years
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart:
Returns
Quarter ended
Highest Quarter Return
2.65%
December 31, 2008
Lowest Quarter Return
-0.06%
March 31, 2011
Year-to-Date Return
0.04%
June 30, 2015
Performance Table Heading rr_PerformanceTableHeading Average Annual Returns
For the periods ended
December 31, 2014
Retail | Term Portfolio | Class: Term Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Shareholder fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management fee (net rate retained by Fidelity Management & Research Company (FMR) after payment of 12b-1 fees to the distributor) rr_ManagementFeesOverAssets 0.18%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.08%
Other expenses rr_OtherExpensesOverAssets none
Total annual operating expenses rr_ExpensesOverAssets 0.26%
1 year rr_ExpenseExampleYear01 $ 27
3 years rr_ExpenseExampleYear03 84
5 years rr_ExpenseExampleYear05 146
10 years rr_ExpenseExampleYear10 $ 331
2005 rr_AnnualReturn2005 2.38%
2006 rr_AnnualReturn2006 4.48%
2007 rr_AnnualReturn2007 5.61%
2008 rr_AnnualReturn2008 5.48%
2009 rr_AnnualReturn2009 0.82%
2010 rr_AnnualReturn2010 0.55%
2011 rr_AnnualReturn2011 0.05%
2012 rr_AnnualReturn2012 0.24%
2013 rr_AnnualReturn2013 0.12%
2014 rr_AnnualReturn2014 0.10%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date Return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2015
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.04%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2008
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.65%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (0.06%)
Label rr_AverageAnnualReturnLabel Term Portfolio
Past 1 year rr_AverageAnnualReturnYear01 0.10%
Past 5 years rr_AverageAnnualReturnYear05 0.21%
Past 10 years rr_AverageAnnualReturnYear10 1.96%
Retail | Term Portfolio | Barclays® U.S. 3-6 Month Treasury Bill Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Barclays® U.S. 3-6 Month Treasury Bill Index
Past 1 year rr_AverageAnnualReturnYear01 0.08%
Past 5 years rr_AverageAnnualReturnYear05 0.15%
Past 10 years rr_AverageAnnualReturnYear10 1.71%