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Fair Value Measurements - Narrative (Detail) - USD ($) | 2 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 | Oct. 19, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Private placement warrants | $ 21,200,000 |  |  |  |
Increase in fair value of warrant liabilities | 1,200,000 | $ 0 | $ 0 | $ 0 | $ 0
Level 1 | Fair Value, Recurring |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Public warrants | 46,900,000 |  | 0 | 0 |
Private placement warrants | $ 0 |  | $ 0 | $ 0 |

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- Definition Warrant liabilities. + References No definition available. + Details
Name: | mir_WarrantLiabilityPrivatePlacement
Namespace Prefix: | mir_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Warrant liability public warrants. + References No definition available. + Details
Name: | mir_WarrantLiabilityPublicWarrants
Namespace Prefix: | mir_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875 + Details
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- 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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