v3.26.1
Cover - shares
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Entity Addresses [Line Items]    
Document Type 20-F  
Amendment Flag false  
Document Registration Statement false  
Document Annual Report true  
Document Transition Report false  
Document Shell Company Report false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --03-31  
Entity File Number 001-42740  
Entity Registrant Name Robot Consulting Co., Ltd.  
Entity Central Index Key 0002007599  
Entity Incorporation, State or Country Code M0  
Entity Address, Address Line One Le Gratteciel Building 2, 6th Floor  
Entity Address, Address Line Two 5-22-6 Shimbashi  
Entity Address, Address Line Three Minato Ward  
Entity Address, City or Town Tokyo  
Entity Address, Country JP  
Entity Address, Postal Zip Code 105-0004  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company true  
Elected Not To Use the Extended Transition Period false  
Document Accounting Standard U.S. GAAP  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding 45,960,000  
Document Financial Statement Error Correction [Flag] false  
Auditor Firm ID 6783 606
Auditor Opinion [Text Block] We have audited the accompanying balance sheet of Robot Consulting Co., Ltd. (the “Company”) as of March 31, 2026, the related statements of operations, shareholders’ equity/(deficit), and cash flows for the year ended March 31, 2026, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the balance sheet of the Company as of March 31, 2026, and the results of its operations and its cash flows for the year ended March 31, 2026, in conformity with accounting principles generally accepted in the United States of America.  
Auditor Name Assentsure PAC Grassi & Co., CPAs, P.C.
Auditor Location Singapore Jericho, New York
American depositary shares, each representing one ordinary share [Member]    
Entity Addresses [Line Items]    
Title of 12(b) Security American depositary shares, each representing one ordinary share  
Trading Symbol LAWR  
Security Exchange Name NASDAQ  
Ordinary Shares [Member]    
Entity Addresses [Line Items]    
Title of 12(b) Security Ordinary shares  
No Trading Symbol Flag true  
Security Exchange Name NASDAQ  
Business Contact [Member]    
Entity Addresses [Line Items]    
Entity Address, Address Line One Le Gratteciel Building 2, 6th Floor  
Entity Address, Address Line Two 5-22-6 Shimbashi  
Entity Address, Address Line Three Minato Ward  
Entity Address, City or Town Tokyo  
Entity Address, Country JP  
Entity Address, Postal Zip Code 105-0004  
City Area Code +81 3  
Local Phone Number 6280 5477  
Contact Personnel Name Kanato Asagarasu  
Contact Personnel Email Address info@robotconsulting.net