v3.25.2
Cover - shares
 6 Months Ended
Jun. 30, 2025
Aug. 08, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Entity Information [Line Items]    
Entity Registrant Name SIDDHI ACQUISITION CORP  
Entity Central Index Key 0002034037  
Entity File Number 001-42578  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code E9  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Shell Company true  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Contact Personnel [Line Items]    
Entity Address, Address Line One 100 Wall Street  
Entity Address, Address Line Two 20th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10005  
Entity Phone Fax Numbers [Line Items]    
City Area Code (347)  
Local Phone Number 316-8312  
Class A ordinary shares, par value $0.0001 per share    
Entity Listings [Line Items]    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol SDHI  
Security Exchange Name NASDAQ  
Rights, one right to receive one-tenth (1/10th) of one Class A ordinary share    
Entity Listings [Line Items]    
Title of 12(b) Security Rights, one right to receive one-tenth (1/10th) of one Class A ordinary share  
Trading Symbol SDHIR  
Security Exchange Name NASDAQ  
Units, each consisting of one Class A ordinary share and one right to receive one-tenth (1/10th) of one Class A ordinary shares    
Entity Listings [Line Items]    
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one right to receive one-tenth (1/10th) of one Class A ordinary shares  
Trading Symbol SDHIU  
Security Exchange Name NASDAQ  
Class A Ordinary Shares    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   27,938,000
Class B Ordinary Shares    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   6,900,000