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DEFICIENCY IN STOCKHOLDERS' EQUITY - Summary of Warrant Activity (Details) - Warrants - $ / shares | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
MAI shares |  |
Warrants outstanding at beginning | 4,924,452 | 540,905
Warrants exercised | 46,873,726 |
Warrants granted | 192,785,950 | 4,480,855
Warrants expired |  | (97,308)
Warrants outstanding at ending | 150,836,676 | 4,924,452
Weighted Average Exercise Price |  |
Warrants outstanding at beginning | $ 0.69 | $ 0.69
Warrants exercised | 8.84 |
Warrants granted | 2.39 | 0.69
Warrants expired |  | 0.69
Warrants outstanding at ending | $ 0.60 | $ 0.69

X
- Definition Represents the number of warrants exercised during the period. + References No definition available. + Details
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Namespace Prefix: | muln_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of warrants expired during the period. + References No definition available. + Details
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Namespace Prefix: | muln_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of warrants granted during the period. + References No definition available. + Details
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Namespace Prefix: | muln_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Definition Represents the weighted average exercise price of warrants exercised. + References No definition available. + Details
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- Definition Represents the weighted average exercise price of warrants expired. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Period Type: |