| Document and Entity Information | Mar. 18, 2024 |
| Entity Listings [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 18, 2024 |
| Entity File Number | 001-40201 |
| Entity Registrant Name | ROSS ACQUISITION CORP II |
| Entity Central Index Key | 0001841610 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Tax Identification Number | 95-1578557 |
| Entity Address, Address Line One | 1 Pelican Lane |
| Entity Address, City or Town | Palm Beach |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33480 |
| City Area Code | 561 |
| Local Phone Number | 655-2615 |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Common Class A [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one Class A ordinary share, $0.0001 par value per share, and one-third of one redeemable warrant |
| Trading Symbol | ROSS.U |
| Security Exchange Name | NYSE |
| Class A ordinary shares, $0.0001 par value per share [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Class A ordinary shares, $0.0001 par value per share |
| Trading Symbol | ROSS |
| Security Exchange Name | NYSE |
| Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share |
| Trading Symbol | ROSS.WS |
| Security Exchange Name | NYSE |
