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RELATED PARTY TRANSACTIONS - Equity Warrants (EXCHANGE AGREEMENT and EQUITY WARRANTS) - (Details) - USD ($) | Sep. 30, 2021 | May 26, 2021
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RELATED PARTY TRANSACTIONS |  |
Warrants, fixed and determinable price per common share | $ 8.84 |
Fair value of the MAI warrants | $ 13,700,000 | $ 24,358,875

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- Definition Represents the fixed and determinable price of warrants per common share. + References No definition available. + Details
Name: | muln_WarrantsFixedAndDeterminablePricePerCommonShare
Namespace Prefix: | muln_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
Name: | us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant