S-K 1603(a)(9) Restrictions on Selling Securities	Oct. 10, 2025
SPAC Sponsor and Affiliates Information, Restrictions on Sale of SPAC Securities [Line Items]
SPAC Sponsor, Terms That Would Result in Earlier Expiration of Restrictions [Text Block]	In addition, in order to facilitate our initial business combination or for any other reason determined by our sponsor in its sole discretion, our sponsor may surrender or forfeit, transfer or exchange our initial shares, private units or any of our other securities, including for no consideration, as well as subject any such securities to earn-outs or other restrictions, or otherwise amend the terms of any such securities or enter into any other arrangements with respect to any such securities.
Class B Ordinary Shares [Member]
SPAC Sponsor and Affiliates Information, Restrictions on Sale of SPAC Securities [Line Items]
SPAC Sponsor, Description of Expiration Dates of Restrictions [Text Block]	The earlier (1) 180 days after the completion of our initial business combination; or (2) the date following the consummation of our initial business combination on which we complete a liquidation, merger, share exchange or other similar transaction that results in all of our shareholders having the right to exchange their shares for cash, securities or other property (the “Lock-Up”). Notwithstanding the foregoing, the initial shares will be released from the Lock-Up if (1) the reported closing price of our ordinary shares equals or exceeds $12.00 per share (as adjusted for share splits, share capitalizations, reorganizations and recapitalizations) for any 20 trading days within any 30-trading day period commencing at least 90 days after our initial business combination or (2) we complete a liquidation, merger, share exchange or other similar transaction after our initial business combination that results in all of our shareholders having the right to exchange their shares for cash, securities or other property.
SPAC Sponsor, Persons and Entities Subject to Restrictions	Westin Investment Co. Ltd.
SPAC Sponsor, Description of Exceptions to Restrictions [Text Block]	Transfers permitted (a) to our officers, directors, advisors or consultants, any affiliate or family member of any of our officers, directors, advisors or consultants, any members or partners of the sponsor or their affiliates and funds and accounts advised by such members or partners, any affiliates of the sponsor, or any employees of such affiliates, (b) in the case of an individual, as a gift to such person’s immediate family or to a trust, the beneficiary of which is a member of such person’s immediate family, an affiliate of such person or to a charitable organization; (c) in the case of an individual, by virtue of laws of descent and distribution upon death of such person; (d) in the case of an individual, pursuant to a qualified domestic relations order; (e) by private sales or transfers made in connection with any forward purchase agreement or similar arrangement, in connection with an extension of the completion window or in connection with the consummation of a business combination at prices no greater than the price at which the shares or units were originally purchased; (f) pro rata distributions from our sponsor to its respective members, partners or shareholders pursuant to our sponsor’s memorandum and articles of association or other charter documents; (g) by virtue of the laws of the Cayman Islands or our sponsor’s
Private Placement Units [Member]
SPAC Sponsor and Affiliates Information, Restrictions on Sale of SPAC Securities [Line Items]
SPAC Sponsor, Description of Expiration Dates of Restrictions [Text Block]	30 days after the completion of our initial business combination
SPAC Sponsor, Persons and Entities Subject to Restrictions	Westin Investment Co. Ltd.
SPAC Sponsor, Description of Exceptions to Restrictions [Text Block]	Same as above
Representative shares [Member]
SPAC Sponsor and Affiliates Information, Restrictions on Sale of SPAC Securities [Line Items]
SPAC Sponsor, Description of Expiration Dates of Restrictions [Text Block]	180 days following the date of the commencement of sales of this offering
SPAC Sponsor, Persons and Entities Subject to Restrictions	Alliance Global Partners
SPAC Sponsor, Description of Exceptions to Restrictions [Text Block]	Transfers permitted to any underwriter and selected dealer participating in the offering and their officers, partners, registered persons or affiliates.

Westin Acquisition Corp S-1/A