v3.26.1
Cover
 12 Months Ended
Mar. 31, 2026
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Financial Statement Error Correction [Flag] false
Document Shell Company Report false
Entity Interactive Data Current Yes
Document Accounting Standard U.S. GAAP
ICFR Auditor Attestation Flag false
Amendment Flag false
Document Period End Date Mar. 31, 2026
Document Fiscal Year Focus 2026
Document Fiscal Period Focus FY
Entity Registrant Name J-LONG GROUP LIMITED
Entity Central Index Key 0001948436
Entity File Number 001-41901
Entity Incorporation, State or Country Code E9
Current Fiscal Year End Date --03-31
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Shell Company false
Entity Filer Category Non-accelerated Filer
Entity Ex Transition Period false
Entity Emerging Growth Company true
Entity Address, Address Line One 3A
Entity Address, Address Line Two Hong Kong Spinners Industrial Building (Phase 1&2)No. 800
Entity Address, City or Town Cheung Sha Wan RoadKowloon
Entity Address, Country HK
Entity Address, Postal Zip Code 00000
Title of 12(b) Security Class A Ordinary Shares, par value US$0.000375
Trading Symbol JL
Security Exchange Name NASDAQ
Class A Ordinary Shares  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 1,652,701
Class B Ordinary Shares  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 2,109,000
Business Contact  
Document Information [Line Items]  
Contact Personnel Name Edwin Chun Yin Wong
Contact Personnel Email Address edwin.wong@j-long.com
Entity Address, Address Line One 3A
Entity Address, Address Line Two Hong Kong Spinners Industrial Building (Phase 1&2)No. 800
Entity Address, City or Town Cheung Sha Wan RoadKowloon
Entity Address, Country HK
Entity Address, Postal Zip Code 00000
City Area Code +852
Local Phone Number 3693 2110