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LEASES - Additional Information (Details) - USD ($)				12 Months Ended
	Jun. 29, 2022	Jun. 22, 2022	Nov. 11, 2021	Sep. 30, 2022
Lessee, Lease, Description [Line Items]
Option to extend				true
Option to terminate				true
General Office Space Lease for Property At Irvine, CA | Lakeview Business Center, LLC
Lessee, Lease, Description [Line Items]
Operating lease term	36 months
Monthly rent	$ 29,231.85
Lease for Property At Monrovia CA
Lessee, Lease, Description [Line Items]
Operating lease term		3 years
Lease for Property At Monrovia CA | Alber K Karamanoukian Trust
Lessee, Lease, Description [Line Items]
Monthly base rent		$ 71,447
Leased properties, Saleen Motors International LLC
Lessee, Lease, Description [Line Items]
Payments for purchase of plant			$ 12,000,000
Minimum
Lessee, Lease, Description [Line Items]
Operating lease term				1 year
Renewal term				1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease term				3 years
Renewal term				5 years

X

- Definition

Amount of monthly base operating lease rent.

+ References

No definition available.

+ Details

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Namespace Prefix:	muln_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of monthly operating lease rent.

+ References

No definition available.

+ Details

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Namespace Prefix:	muln_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash outflow associated with purchased the property on lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	muln_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Indicates (true false) whether lessee has option to extend operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Indicates (true false) whether lessee has option to terminate operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

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Namespace Prefix:	us-gaap_
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X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

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- Details

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- Details

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X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
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- Details

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