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DEFICIENCY IN STOCKHOLDERS' EQUITY - Summary of Warrant Activity (Details) - $ / shares | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
MAI shares |  |
Warrants outstanding at ending | 4,924,447 |
Weighted Average Exercise Price |  |
Warrants outstanding at ending | $ 0.6877 |
Warrants |  |
MAI shares |  |
Warrants outstanding at beginning | 540,905 | 97,308
Warrants granted | 4,480,855 | 420,242
Warrants expired | (97,308) |
Warrants outstanding at ending | 4,924,447 | 540,905
Weighted Average Exercise Price |  |
Warrants outstanding at beginning | $ 8.84 | $ 8.84
Warrants granted | 8.84 | 8.84
Warrants expired | 8.84 |
Warrants outstanding at ending | $ 8.84 | $ 8.84

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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Namespace Prefix: | muln_
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Period Type: | duration

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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 http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
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