| Document and Entity Information | Aug. 15, 2021 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | Mudrick Capital Acquisition Corp. II |
| Amendment Flag | false |
| Entity Central Index Key | 0001820727 |
| Document Type | 8-K |
| Document Period End Date | Aug. 15, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39771 |
| Entity Tax Identification Number | 85-2320197 |
| Entity Address, Address Line One | 527 Madison Avenue |
| Entity Address, Address Line Two | 6th Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10022 |
| City Area Code | (646) |
| Local Phone Number | 747-9500 |
| 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 |
| Units Each Consisting Of One Share Of Class Common Stock And One Half Of One Warrant [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Units, each consisting of one share of Class A common stock, and one-half of one Redeemable Warrant |
| Trading Symbol | MUDSU |
| Security Exchange Name | NASDAQ |
| Common Class B [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | MUDS |
| Security Exchange Name | NASDAQ |
| Warrants Each Whole Warrant Exercisable For One Share Of Class Common Stock At Exercise Price [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Redeemable Warrants, each whole warrant exercisable for one share of Class A Common Stock at an exercise price of $11.50 |
| Trading Symbol | MUDSW |
| Security Exchange Name | NASDAQ |
