| Cover - USD ($) $ in Millions | 12 Months Ended | | |
| Dec. 31, 2022 | Apr. 14, 2023 | Jun. 30, 2022 |
| Entity Information [Line Items] | | | |
| Document Type | 10-K/A | | |
| Document Annual Report | true | | |
| Document Period End Date | Dec. 31, 2022 | | |
| Current Fiscal Year End Date | --12-31 | | |
| Document Transition Report | false | | |
| Entity File Number | 001-39835 | | |
| Entity Registrant Name | Benson Hill, Inc. | | |
| Entity Incorporation, State Code | DE | | |
| Entity Tax Identification Number | 85-3374823 | | |
| Entity Address, Address Line One | 1001 North Warson Rd | | |
| Entity Address, City or Town | St. Louis, | | |
| Entity Address, State or Province | MO | | |
| Entity Address, Postal Zip Code | 63132 | | |
| City Area Code | (314) | | |
| Local Phone Number | 222-8218 | | |
| Entity Well-known Seasoned Issuer | No | | |
| Entity Voluntary Filers | No | | |
| Entity Current Reporting Status | Yes | | |
| Entity Interactive Data Current | Yes | | |
| Entity Filer Category | Accelerated Filer | | |
| Entity Small Business | false | | |
| Entity Emerging Growth Company | true | | |
| Entity Ex Transition Period | false | | |
| ICFR Auditor Attestation Flag | false | | |
| Entity Shell Company | false | | |
| Entity Public Float | | | $ 552 |
| Entity Common Stock, Shares Outstanding | | 207,467,251 | |
| Documents Incorporated by Reference | None. | | |
| Entity Central Index Key | 0001830210 | | |
| Document Fiscal Year Focus | 2022 | | |
| Document Fiscal Period Focus | FY | | |
| Amendment Flag | true | | |
| Amendment Description | Benson Hill, Inc. (the “Company,” “Benson Hill,” “we,” “us” or “our”) is filing this Amendment No. 1 on Form 10-K/A (this “Amendment”) to amend our Annual Report on Form 10-K for the year ended December 31, 2022, originally filed with the Securities and Exchange Commission (the “SEC”) on March 16, 2023 (the “Original 10-K”), to include the information required by Items 10 through 14 of Part III of Form 10-K. This Part III information was previously omitted from the Original 10-K in reliance on General Instruction G(3) to Form 10-K, which permits the information in the above referenced items to be incorporated in the Form 10-K by reference from our definitive proxy statement if such statement is filed no later than 120 days after our fiscal year-end. We are filing this Amendment to include Part III information in our Form 10-K because a definitive proxy statement containing such information may not be filed by Benson Hill within 120 days after the end of the fiscal year covered by the Form 10-K.In accordance with Rule 12b-15 under the Securities and Exchange Act of 1934, as amended (the “Exchange Act”), Part III, Items 10 through 14 of the Original 10-K are hereby amended and restated in their entirety. Additionally, in accordance with Rules 12b-15 and 13a-14 under the Exchange Act, we have amended Part IV, Item 15 to include currently dated certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. Since no new financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4, and 5 of the certifications have been omitted. Similarly, since no financial statements have been included in this Amendment, certifications pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 have been omitted.Except for the changes to Part III and the filing of related certifications added to the list of Exhibits in Part IV, this Amendment makes no changes to the Original 10-K. This Amendment does not reflect events occurring after the filing of the Original 10-K or modify disclosures affected by subsequent events. Terms used but not otherwise defined in the Amendment have such meaning as ascribed to them in the Original 10-K. | | |
| Common Stock, $0.0001 par value | | | |
| Entity Information [Line Items] | | | |
| Title of 12(b) Security | Common Stock, $0.0001 par value | | |
| Trading Symbol | BHIL | | |
| Security Exchange Name | NYSE | | |
| Warrants exercisable for one share of common stock at an exercise price of $11.50 | | | |
| Entity Information [Line Items] | | | |
| Title of 12(b) Security | Warrants exercisable for one share of common stock at an exercise price of $11.50 | | |
| Trading Symbol | BHIL WS | | |
| Security Exchange Name | NYSE | | |
