| Document and Entity Information | Jul. 23, 2024 |
| Entity Listings [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 23, 2024 |
| Entity File Number | 001-41571 |
| Entity Registrant Name | MariaDB plc |
| Entity Central Index Key | 0001929589 |
| Entity Incorporation, State or Country Code | L2 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Address, Address Line One | 699 Veterans Blvd |
| Entity Address, City or Town | Redwood City |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94063 |
| City Area Code | 855 |
| Local Phone Number | 562-7423 |
| 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 Stock [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Ordinary Shares, nominal value $0.01 per share |
| Trading Symbol | MRDB |
| Security Exchange Name | NYSE |
| Warrants, each whole warrant exercisable for one Ordinary Share at an exercise price of $11.50 per share [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for one Ordinary Share at an exercise price of $11.50 per share |
| Trading Symbol | MRDBW |
| Security Exchange Name | NYSE |
