S-K 1603(a)(9) Restrictions on Selling Securities	Jan. 23, 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]	Up to 1,607,143 of the founder shares will be surrendered for no consideration depending on the extent to which the underwriters’ over-allotment option is exercised. 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 founder 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. We may also issue Class A ordinary shares upon conversion of the Class B ordinary shares at a ratio greater than one-to-one at the time of our initial business combination as a result of the anti-dilution provisions as set forth herein.
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 completion of our initial business combination.
SPAC Sponsor, Persons and Entities Subject to Restrictions	D. Boral Sponsor I LLC David Boral John Darwin Gaurav Verma Benjamin Piggott Luisa Ingargiola Jeffrey Tullman George Kollitides Kevin McGurn Transfers permitted (a
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 respective 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 warrants were originally purchased; (f) pro rata distributions from our sponsor to its respective members, partners or shareholders pursuant to our sponsor’s limited liability company agreement or other charter documents; (g) by virtue of the laws of the State of Delaware or our sponsor’s limited liability company agreement upon dissolution of our sponsor, (h) in the event of our liquidation prior to our consummation of our initial business combination; (i) in the event that, subsequent to our consummation of an initial business combination, we complete 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 or (j) to a nominee or custodian of a person or entity to whom a transfer would be permissible under clauses (a) through (g); provided, however, that in the case of clauses (a) through (g) and clause (j) these permitted transferees must enter into a written agreement agreeing to be bound by these transfer restrictions and the other restrictions contained in the letter agreements (a transfer permitted by clauses (a) through (j) of this sentence is referred to as a “Permitted Transfer”).
Private 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]	Locked up until the closing of the initial business combination
SPAC Sponsor, Persons and Entities Subject to Restrictions	D. Boral Sponsor I LLC David Boral John Darwin Gaurav Verma Benjamin Piggott
SPAC Sponsor, Description of Exceptions to Restrictions [Text Block]	The securities are not transferable or saleable except in each case (a) to the subscriber’s officers or directors, any affiliates or family members of any of the Subscriber’s officers or directors, any members of the sponsor, or any affiliates of the sponsor, (b) in the case of an individual, by gift to a member of the individual’s immediate family or to a trust, the beneficiary of which is a member of the individual’s immediate family or 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 the individual; (d) in the case of an individual, pursuant to a qualified domestic relations order; (e) by virtue of the laws of the State of New York or Subscriber’s partnership agreement in the event of a subscriber’s liquidation; (f) in the event of the Company’s liquidation prior to the consummation of a Business Combination; provided, however, that in the case of clauses (a) through (f) these permitted transferees must enter into a written agreement agreeing to be bound by these transfer restrictions and by the same agreements entered into by the sponsor and the Subscriber with respect to such securities.

D. Boral Acquisition I Corp. S-1/A