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Shareholder Report
 12 Months Ended
Jun. 30, 2025
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name The North Carolina Capital Management Trust
Entity Central Index Key 0000702149
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2025
North Carolina Capital Management Trust - Government Portfolio  
Shareholder Report [Line Items]  
Fund Name Government Portfolio
Class Name Government Portfolio
Trading Symbol NCCTX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains information about Government Portfolio for the period July 1, 2024 to June 30, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-222-3232.
Additional Information Phone Number 1-800-222-3232
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
 
FUND COST (PREVIOUS YEAR)
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Government Portfolio 
$ 14 
0.14%
  
Expenses Paid, Amount $ 14
Expense Ratio, Percent 0.14%
Net Assets $ 21,807,343,370
Holdings Count | shares 474
Advisory Fees Paid, Amount $ 44,737,361
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS
 
  
  
Fund Size
$21,807,343,370
  
Number of Holdings
474
  
Total Advisory Fee
$44,737,361
  
Holdings [Text Block]   EFFECTIVE MATURITY DIVERSIFICATION (% of Fund's net assets)   Days   1-7 53.7   8-30 19.2   31-60 8.9   61-90 12.6   91-180 2.9   >180 5.8             U.S. Government Agency - Debt 52.3 U.S. Treasury Obligations 44.0 Repurchase Agreements 6.8 ASSET ALLOCATION (% of Fund's net assets)     U.S. Government Agency - Debt - 52.3       U.S. Treasury Obligations - 44.0           Repurchase Agreements - 6.8              Net Other Assets (Liabilities) - (3.1)%