| Document and Entity Information | Aug. 27, 2021 |
| Document And Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 27, 2021 |
| Entity Registrant Name | Hyzon Motors Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39632 |
| Entity Tax Identification Number | 82-2726724 |
| Entity Address, Address Line One | 475 Quaker Meeting House Road |
| Entity Address, City or Town | Honeoye Falls |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 14472 |
| City Area Code | 585 |
| Local Phone Number | 484-9337 |
| 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 | 0001716583 |
| 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 | HYZN |
| 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 | HYZNW |
| Security Exchange Name | NASDAQ |
