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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Revenue from Contract with Customer [Abstract] |  |
Contract liabilities totaled | $ 0.0 | $ 0.7

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- Definition Contract liabalities totalated. + References No definition available. + Details
Name: | mtus_ContractLiabalitiesTotalated
Namespace Prefix: | mtus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration