S-K 1603(a)(9) Restrictions on Selling Securities	Mar. 05, 2026
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 (or its relevant affiliate) may surrender or forfeit, transfer or exchange our founder shares, private placement units (and the underlying securities) or any of our other securities, including for no consideration, or otherwise amend the terms of any such securities or enter into any other arrangements with respect to any such securities. Although such actions are subject to the transfer and other restrictions affecting the founder shares and private placement units (and the underlying securities) set forth in the letter agreement and described elsewhere in this prospectus, there are no restrictions on the managing members’ ability to transfer equity interests in the sponsor held by the managing members or otherwise consent to a transfer of equity interests in the sponsor by another member, and transfers of equity interests in the sponsor may result in a change of ownership or control of the sponsor.
Founder 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 of (i) 180 days after the completion of our initial business combination and (ii) subsequent to our initial business combination, the date on which we complete a liquidation, merger, share exchange or other similar transaction which results in all of our shareholders having the right to exchange their ordinary shares for cash, securities or other property.
SPAC Sponsor, Persons and Entities Subject to Restrictions	KPET Ultra Paceline LLC Karl Peterson Eduardo Tamraz
SPAC Sponsor, Description of Exceptions to Restrictions [Text Block]	Permitted transfers include: (a) transfers to our officers or directors, any affiliates or family members of any of our officers or directors, any members of our sponsor or their affiliates, or any affiliates of our sponsor, (b) in the case of an individual, transfers by gift to members of the individual’s immediate family or to a trust, the beneficiary of which is a member of one of the individual’s immediate family, an affiliate of such person or to a charitable organization; (c) in the case of an individual, transfers by virtue of laws of descent and distribution upon death of the individual; (d) in the case of an individual, transfers pursuant to a qualified domestic relations order; (e) transfers by virtue of the laws of our sponsor’s operating agreement upon dissolution of our sponsor; (f) transfers by virtue of the laws of any affiliates of our sponsor’s operating agreement upon dissolution of such affiliate; (g) transfers by private sales or transfers made in connection with the consummation of a business combination at prices no greater than the price at which the securities were originally purchased; (h) transfers in the event of our liquidation prior to the completion of an initial business combination; and (i) transfers in the event of completion of a liquidation, merger, share exchange or other similar transaction which results in all of our shareholders having the right to exchange their Class A ordinary shares for cash, securities or other property subsequent to the completion of an initial business combination; provided, however, that, in the case of (a)-(g), the permitted transferees must enter into a written agreement agreeing to be bound by these transfer restrictions.
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	KPET Ultra Paceline LLC (or its relevant affiliate)
SPAC Sponsor, Description of Exceptions to Restrictions [Text Block]	Same as above

KPET Ultra Paceline Corp S-1