Cover - USD ($) $ in Thousands	12 Months Ended
Cover - USD ($) $ in Thousands	Nov. 30, 2025	Mar. 06, 2026	May 31, 2025
Document Type	10-K/A
Amendment Flag	true
Amendment Description	This Amendment No. 1 to the Annual Report on Form 10-K (this “Amendment”) amends the Annual Report on Form 10-K of Black Hawk Acquisition Corporation (the “Company”) for the fiscal year ended November 30, 2025, as originally filed with the Securities and Exchange Commission on March 6, 2026 (the “Original Filing”). This Amendment is being filed solely to include the Company’s Compensation Recovery (Clawback) Policy, as adopted by its Board of Directors, as Exhibit 97.1 to the Original Filing, which was inadvertently omitted. No other changes have been made to the Original Filing. This Amendment does not reflect events occurring after the filing of the Original Filing and does not modify or update the disclosures contained in the Original Filing in any way other than as described above.
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Nov. 30, 2025
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2025
Current Fiscal Year End Date	--11-30
Entity File Number	001-41667
Entity Registrant Name	Black Hawk Acquisition Corporation
Entity Central Index Key	0002000775
Entity Tax Identification Number	00-0000000
Entity Incorporation, State or Country Code	E9
Entity Address, Address Line One	4125 Blackhawk Plaza Circle
Entity Address, Address Line Two	Suite 166
Entity Address, City or Town	Danville
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94506
City Area Code	(925)
Local Phone Number	217-4482
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 Small Business	true
Entity Emerging Growth Company	true
Elected Not To Use the Extended Transition Period	false
Entity Shell Company	true
Entity Public Float			$ 73,900
Entity Common Stock, Shares Outstanding		4,153,577
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Units, each consisting of one ordinary share, $0.0001 par value, and one-fifth (1/5) of one right entitling the holder thereof to receive one Class A ordinary share upon the consummation of our initial business combination
Title of 12(b) Security	Units, each consisting of one ordinary share, $0.0001 par value
Trading Symbol	BKHAU
Security Exchange Name	NASDAQ
Ordinary shares, par value $0.0001 per share
Title of 12(b) Security	Ordinary shares, par value $0.0001 per share
Trading Symbol	BKHA
Security Exchange Name	NASDAQ
Rights, each right entitling the holder to receive one Class A ordinary share upon the consummation of our initial business combination
Title of 12(b) Security	Rights, each right entitling the holder to receive one Class A ordinary share upon the consummation of our initial business combination
Trading Symbol	BKHAR
Security Exchange Name	NASDAQ

Black Hawk Acquisition Corp 10-K/A