| Document and Entity Information | Nov. 17, 2021 |
| Document And Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 17, 2021 |
| Entity Registrant Name | Kadem Sustainable Impact Corp |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40224 |
| Entity Tax Identification Number | 86-1306839 |
| Entity Address, Address Line One | 30 Broad Street |
| Entity Address, Address Line Two | 14th Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10004 |
| City Area Code | 917 |
| Local Phone Number | 841-6202 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001843351 |
| Capital Units [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one share of Class A common stock and one-half of one warrant |
| Trading Symbol | KSICU |
| Security Exchange Name | NASDAQ |
| Common Class A [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | Class A common stock, par value $0.0001 per share |
| Trading Symbol | KSI |
| Security Exchange Name | NASDAQ |
| Warrant [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50 per share |
| Trading Symbol | KSICW |
| Security Exchange Name | NASDAQ |
