| Cover | Oct. 04, 2024 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 04, 2024 |
| Entity File Number | 001-42214 |
| Entity Registrant Name | SilverBox Corp IV |
| Entity Central Index Key | 0002015947 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | 1250 S. Capital of Texas Highway, |
| Entity Address, Address Line Two | Building 2, Suite 285 |
| Entity Address, City or Town | Austin |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 78746 |
| City Area Code | 512 |
| Local Phone Number | 575-3637 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-third of one redeemable warrant [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-third of one redeemable warrant |
| Trading Symbol | SBXD.U |
| Security Exchange Name | NYSE |
| Class A ordinary shares included as part of the units [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A ordinary shares included as part of the units |
| Trading Symbol | SBXD |
| Security Exchange Name | 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 [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | 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 |
| Trading Symbol | SBXD WS |
| Security Exchange Name | NYSE |
