| Cover | Nov. 08, 2024 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 08, 2024 |
| Entity File Number | 001-41529 |
| Entity Registrant Name | SPRING VALLEY ACQUISITION CORP. II |
| Entity Central Index Key | 0001843477 |
| Entity Tax Identification Number | 98-1579063 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | 2100 McKinney Ave. |
| Entity Address, Address Line Two | Suite 1675 |
| Entity Address, City or Town | Dallas |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75201 |
| City Area Code | 214 |
| Local Phone Number | 308-5230 |
| 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 |
| Unitseachconsistingofone Class Aordinarysharedollar 00001parvalueonerightandonehalfofoneredeemablepublicwarrant [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one Class A ordinary share, $0.0001 par value, one right and one-half of one redeemable public warrant |
| Trading Symbol | SVIIU |
| Security Exchange Name | NASDAQ |
| Common Class A [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A ordinary shares, par value $0.0001 per share |
| Trading Symbol | SVII |
| Security Exchange Name | NASDAQ |
| Rightsincludedaspartoftheunitstoacquireonetenth 110ofoneshareof Class Aordinaryshare [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Rights included as part of the units to acquire one-tenth (1/10) of one share of Class A ordinary share |
| Trading Symbol | SVIIR |
| Security Exchange Name | NASDAQ |
| Redeemablepublicwarrantsincludedaspartoftheunitseachwholewarrantexercisableforone Class Aordinaryshareatanexercisepriceofdollar 11. 50 [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Redeemable public warrants included as part of the units; each whole warrant exercisable for one Class A ordinary share at an exercise |
| Trading Symbol | SVIIW |
| Security Exchange Name | NASDAQ |
