Summary of Significant Accounting Policies - Schedule of Term Loan Advances (Details) $ in Thousands	12 Months Ended
Mar. 31, 2025 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance of Term Loan Advances as of April 1, 2024	$ 300
Issued	450
Change in fair value	0
Interest accrued	4
Conversion	(754)
Balance of Term Loan Advances as of March 31, 2025	0
Dissenting Shareholders' Liability [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Initial value upon re-domestication	4,526
Change in fair value	1,103
Cash settlement of dissenting shareholders' liability	(5,629)
Balance of Dissenting Shareholders' Liability as of April 1, 2024	0
Balance of Dissenting Shareholders' Liability as of March 31, 2025	$ 0

Cash settlement of dissenting shareholders' liability

No definition available.

Name:	omcc_CashSettlementOfDissentingShareholdersLiability
Namespace Prefix:	omcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Change in Fair Value

+ References

No definition available.

+ Details

Name:	omcc_ChangeInFairValue
Namespace Prefix:	omcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Dissenting shareholders' liability

+ References

No definition available.

+ Details

Name:	omcc_DissentingShareholdersLiability
Namespace Prefix:	omcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Initial Value Upon Re-Domestication

+ References

No definition available.

+ Details

Name:	omcc_InitialValueUponReDomestication
Namespace Prefix:	omcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fair value of Federal Home Loan Bank (FHLBank) advances carried under the fair value option.

+ References

No definition available.

+ Details

Name:	us-gaap_AdvancesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-4

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-3

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-5

+ Details

Name:	us-gaap_ConversionOfStockAmountConverted1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Increase for accrued, but unpaid interest on the debt instrument for the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

+ Details

Name:	us-gaap_DebtInstrumentIncreaseAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

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

- Definition

The fair value of notes issued in noncash investing and financing activities.

+ References

+ Details

Name:	us-gaap_NotesIssued1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_LiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: