| Cover | Feb. 02, 2022 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 2, 2022 |
| Entity File Number | 001-40910 |
| Entity Registrant Name | FOUNDER SPAC |
| Entity Central Index Key | 0001862068 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | 11752 Lake Potomac Drive |
| Entity Address, City or Town | Potomac |
| Entity Address, State or Province | MD |
| Entity Address, Postal Zip Code | 20854 |
| City Area Code | (240) |
| Local Phone Number | 418-2649 |
| Written Communications | true |
| 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 and one-half of one redeemable warrant | |
| Title of 12(b) Security | Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant |
| Trading Symbol | FOUNU |
| Security Exchange Name | NASDAQ |
| Class A ordinary shares, par value $0.0001 per share | |
| Title of 12(b) Security | Class A ordinary shares, par value $0.0001 per share |
| Trading Symbol | FOUN |
| Security Exchange Name | NASDAQ |
| Redeemable warrants, each warrant exercisable for one Class A ordinary share, each at an exercise price of $11.50 per share | |
| Title of 12(b) Security | Redeemable warrants, each warrant exercisable for one Class A ordinary share, each at an exercise price of $11.50 per share |
| Trading Symbol | FOUNW |
| Security Exchange Name | NASDAQ |
