| Document and Entity Information | Oct. 04, 2024 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001840425 |
| Document Type | 8-K |
| Document Period End Date | Oct. 04, 2024 |
| Entity Registrant Name | BELLEVUE LIFE SCIENCES ACQUISITION CORP. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-41390 |
| Entity Tax Identification Number | 84-5052822 |
| Entity Address, Address Line One | 10900 NE 4th Street |
| Entity Address, Address Line Two | Suite 2300 |
| Entity Address, City or Town | Bellevue |
| Entity Address, State or Province | WA |
| Entity Address, Postal Zip Code | 98004 |
| City Area Code | (425) |
| Local Phone Number | 635-7700 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Units Each Consisting Of One Share Of Common Stock One Redeemable Warrant And One Right 2 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Units, each consisting of one share of common stock, one redeemable warrant and one right |
| Trading Symbol | BLACU |
| Security Exchange Name | NASDAQ |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common stock, par value $0.0001 per share |
| Trading Symbol | BLAC |
| Security Exchange Name | NASDAQ |
| Redeemable Warrants Exercisable For Shares Of Common Stock At An Exercise Price Of 11.50 Per Share 1 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Redeemable warrants, exercisable for shares of common stock at an exercise price of $11.50 per share |
| Trading Symbol | BLACW |
| Security Exchange Name | NASDAQ |
| Right To Receive Onetenth 110 Of One Share Of Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Right to receive one-tenth (1/10) of one share of common stock |
| Trading Symbol | BLACR |
| Security Exchange Name | NASDAQ |
