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Supplier Finance Programs (Details) - USD ($) | Mar. 31, 2025 | Sep. 30, 2024 | Mar. 31, 2024
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Supplier Finance Programs [Abstract] |  |  |
Amount available under program | $ 30,000,000 | $ 15,000,000 |
Outstanding supplier obligations | $ 33,661,000 |  | $ 1,695,000
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration] | Accounts payable |  |

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- Definition The amount of commitments from participating financial institutions available to suppliers under the supplier finance program. + References No definition available. + Details
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Namespace Prefix: | mpaa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Period Type: | duration

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- Definition Amount of obligation for supplier finance program. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 405 -SubTopic 50 -Name Accounting Standards Codification -Section 55 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477128/405-50-55-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 405 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479468/405-50-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 405 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479468/405-50-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 405 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479468/405-50-50-4 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 405 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479468/405-50-50-3 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 405 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b)(2)(iv) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479468/405-50-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Indicates line item in statement of financial position that includes obligation for supplier finance program. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 405 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479468/405-50-50-3 + Details
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