| Cover | Oct. 19, 2021 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 19, 2021 |
| Entity File Number | 001-39906 |
| Entity Registrant Name | LEGATO MERGER CORP. |
| Entity Central Index Key | 0001820272 |
| Entity Tax Identification Number | 85-1783294 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 777 Third Avenue |
| Entity Address, Address Line Two | 37th Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10017 |
| City Area Code | (212) |
| Local Phone Number | 319-7676 |
| 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 |
| Units, each consisting of one share of common stock and one redeemable warrant | |
| Title of 12(b) Security | Units, each consisting of one share of common stock and one redeemable warrant |
| Trading Symbol | LEGOU |
| Security Exchange Name | NASDAQ |
| Common stock, par value $0.0001 per share | |
| Title of 12(b) Security | Common stock, par value $0.0001 per share |
| Trading Symbol | LEGO |
| Security Exchange Name | NASDAQ |
| Redeemable warrants, exercisable for shares of common stock at an exercise price of $11.50 per share | |
| Title of 12(b) Security | Redeemable warrants, exercisable for shares of common stock at an exercise price of $11.50 per share |
| Trading Symbol | LEGOW |
| Security Exchange Name | NASDAQ |
