0002015947 2026-08-04 2026-08-04 0002015947 SBXD:UnitsEachConsistingOfOneClassaOrdinaryShare0.0001ParValueAndOnethirdOfOneRedeemableWarrantMember 2026-08-04 2026-08-04 0002015947 SBXD:ClassaOrdinarySharesIncludedAsPartOfUnitsMember 2026-08-04 2026-08-04 0002015947 SBXD:RedeemableWarrantsIncludedAsPartOfUnitsEachWholeWarrantExercisableForOneClassaOrdinaryShareAtExercisePriceOf11.50Member 2026-08-04 2026-08-04 false 0002015947 00-0000000 8-K 2026-08-04 SILVERBOX CORP IV E9 001-42214 8701 Bee Cave Road East Building, Suite 310 Austin TX 78746 512 575-3637 true false false false Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-third of one redeemable warrant SBXD.U NYSE Class A ordinary shares included as part of the units SBXD NYSE Redeemable Warrants included as part of the units, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 SBXD.WS NYSE true false