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Document And Entity Information - USD ($)
 12 Months Ended
Nov. 30, 2023
Jan. 16, 2024
May 31, 2023
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Nov. 30, 2023    
Document Transition Report false    
Entity File Number 001-31913    
Entity Registrant Name NOVAGOLD RESOURCES INC    
Entity Incorporation, State or Country Code A1    
Entity Address, Address Line One 201 South Main Street, Suite 400    
Entity Address, City or Town Salt Lake City    
Entity Address, State or Province UT    
Entity Address, Postal Zip Code 84111    
City Area Code 801    
Local Phone Number 639-0511    
Title of 12(b) Security Common Shares    
Trading Symbol NG    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 1,266,900,000
Entity Common Stock, Shares Outstanding (in shares)   334,371,223  
Auditor Name PricewaterhouseCoopers LLP    
Auditor Location Vancouver, Canada    
Auditor Firm ID 271    
Entity Central Index Key 0001173420    
Current Fiscal Year End Date --11-30    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false