S-K 1602(b)(6) Prospectus Summary, Sponsor Compensation	Mar. 30, 2026 USD ($) $ / shares shares
Union Street Sponsor, LLC [Member] \| Class B Ordinary Shares [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares (in Shares) \| shares	7,666,667
Price Paid or to be Paid for Securities, Total Amount	$ 25,000
Union Street Sponsor, LLC [Member] \| Private Placement Units [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares (in Shares) \| shares	350,000
Price Paid or to be Paid for Securities, Total Amount	$ 4,350,000
Price Paid or to be Paid for Securities, Per Share (in Dollars per share) \| $ / shares	$ 10
Union Street Sponsor, LLC [Member] \| Working Capital Loans [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount	$ 1,500,000
Price Paid or to be Paid for Securities, Per Share (in Dollars per share) \| $ / shares	$ 10
Union Street Management Sponsor, LLC [Member] \| Loan [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount	$ 400,000

ACP Holdings Acquisition Corp. S-1/A