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RELATED PARTY TRANSACTIONS - Equity Warrants (EXCHANGE AGREEMENT and EQUITY WARRANTS) - (Details) - USD ($)	Sep. 30, 2021	May 26, 2021
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

X

- 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