Debt Instrument, Basis Spread On Variable Rate, Increase (Decrease)

No definition available.

Name:	mh_DebtInstrumentBasisSpreadOnVariableRateIncreaseDecrease
Namespace Prefix:	mh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Periodic Payment, Percentage

+ References

No definition available.

+ Details

Name:	mh_DebtInstrumentPeriodicPaymentPercentage
Namespace Prefix:	mh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Variable Rate, Floor

+ References

No definition available.

+ Details

Name:	mh_DebtInstrumentVariableRateFloor
Namespace Prefix:	mh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Covenant, Net Leverage Ratio, Aggregate Exposure Threshold, Percentage

+ References

No definition available.

+ Details

Name:	mh_LineOfCreditFacilityCovenantNetLeverageRatioAggregateExposureThresholdPercentage
Namespace Prefix:	mh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit Facility, Covenant, Net Leverage Ratio, Maximum

+ References

No definition available.

+ Details

Name:	mh_LineOfCreditFacilityCovenantNetLeverageRatioMaximum
Namespace Prefix:	mh_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit Facility, Letter Of Credit Fronting Fee, Percentage

+ References

No definition available.

+ Details

Name:	mh_LineOfCreditFacilityLetterOfCreditFrontingFeePercentage
Namespace Prefix:	mh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Long-Term Debt, Remaining Contractual Term

+ References

No definition available.

+ Details

Name:	mh_LongTermDebtRemainingContractualTerm
Namespace Prefix:	mh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Unamortized Debt Discount, Writeoff

+ References

No definition available.

+ Details

Name:	mh_UnamortizedDebtDiscountWriteoff
Namespace Prefix:	mh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
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-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-Publisher FASB
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-Topic 470
-SubTopic 20
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-Section 50
-Paragraph 1F
-Subparagraph (b)(2)
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-Topic 835
-SubTopic 30
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-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-3

+ Details

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

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

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-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
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-SubTopic 10
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-Section S99
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-Topic 835
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-Section 45
-Paragraph 3
-Publisher FASB
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+ Details

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
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-Section 55
-Paragraph 8
-Publisher FASB
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-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
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-SubTopic 50
-Section 40
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481303/470-50-40-4

+ Details

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
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-Section S45
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-Publisher FASB
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-Topic 210
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-Topic 210
-SubTopic 10
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-Section S99
-Paragraph 1
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-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

+ References

+ Details

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

- Definition

The effective interest rate at the end of the reporting period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 8
-Publisher FASB
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-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
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-Section S45
-Paragraph 1
-Publisher FASB
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-Topic 942
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-Section S99
-Paragraph 1
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-Topic 210
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-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
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-Topic 235
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
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-Topic 470
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-Topic 470
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-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-SubTopic 10
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+ Details

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

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
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+ Details

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

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-Publisher FASB
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+ Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=mh_TermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mh_AECashFlowCreditFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mh_AECashFlowCreditFacilitiesAETermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mh_VariableRateComponentAxis=mh_VariableRateComponentOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mh_VariableRateComponentAxis=mh_VariableRateComponentTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mh_AECashFlowCreditFacilitiesNonExtendedCashFlowRevolverFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mh_AECashFlowCreditFacilitiesAECashFlowRevolvingFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - A&E Cash Flow Credit Facilities, Narrative (Details) - USD ($) $ in Thousands									3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 10, 2025	Oct. 16, 2025	Sep. 08, 2025	Jul. 25, 2025	Mar. 31, 2025	Feb. 06, 2025	Aug. 06, 2024	Dec. 31, 2024	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Aug. 05, 2024
Line of Credit Facility [Line Items]
Proceeds from issuance of secured debt											$ 0	$ 650,000	$ 0
Loss on extinguishment of debt											25,766	2,719	(3,415)
Amortization of debt discount											13,000	20,722	15,492
Amortization of deferred financing costs											4,943	10,495	5,503
Total debt outstanding	$ 2,632,340					$ 3,277,915				$ 2,632,340	2,632,340	3,277,915
Term Loan Facility
Line of Credit Facility [Line Items]
Payment of secured debt											$ 0	754,875	21,250
A&E Cash Flow Credit Facilities \| Line of Credit
Line of Credit Facility [Line Items]
Aggregate exposure threshold percentage for net leverage ratio	40.00%									40.00%	40.00%
Maximum net leverage ratio	6.95									6.95	6.95
A&E Cash Flow Credit Facilities \| Line of Credit \| Base Rate
Line of Credit Facility [Line Items]
Variable rate floor				1.50%
A&E Cash Flow Credit Facilities \| Line of Credit \| Term SOFR
Line of Credit Facility [Line Items]
Variable rate floor				0.50%
A&E Term Loan Facility
Line of Credit Facility [Line Items]
Payment of secured debt											$ 605,575	156,585	$ 0
Secured Debt \| Term Loan Facility \| Line of Credit
Line of Credit Facility [Line Items]
Payment of secured debt								$ 2,066,563
Loss on extinguishment of debt								2,719
Write off of unamortized debt discount								1,008
Write off of unamortized deferred financing fees								277
Secured Debt \| A&E Term Loan Facility \| Line of Credit
Line of Credit Facility [Line Items]
Payment of secured debt	$ 6,708	$ 50,000	$ 150,000		$ 385,698	50,000			$ 100,000
Loss on extinguishment of debt					$ 16,361					$ 8,441
Write off of unamortized deferred financing fees								1,434
Amortization of debt discount						1,964			3,853
Amortization of deferred financing costs						375			$ 736
Debt issued				$ 771,425			$ 1,213,708
Reduction in margin percentage							0.75%
Total debt outstanding	554,840					$ 1,160,415				554,840	554,840	$ 1,160,415
Long-term debt fair value	$ 553,453									$ 553,453	$ 553,453
Remaining contractual term	5 years 4 months 24 days									5 years 4 months 24 days	5 years 4 months 24 days
Interest rate percentage at period end	6.418%									6.418%	6.418%
Annual amortization payable percentage				1.00%
Secured Debt \| A&E Term Loan Facility \| Line of Credit \| Maximum
Line of Credit Facility [Line Items]
Reduction in margin percentage				0.75%
Secured Debt \| A&E Term Loan Facility \| Line of Credit \| Variable Rate Component, One \| Base Rate
Line of Credit Facility [Line Items]
Margin percentage				1.75%
Secured Debt \| A&E Term Loan Facility \| Line of Credit \| Variable Rate Component, One \| Term SOFR
Line of Credit Facility [Line Items]
Margin percentage				2.75%
Secured Debt \| A&E Term Loan Facility \| Line of Credit \| Variable Rate Component, Two \| Base Rate
Line of Credit Facility [Line Items]
Margin percentage				1.50%
Secured Debt \| A&E Term Loan Facility \| Line of Credit \| Variable Rate Component, Two \| Term SOFR
Line of Credit Facility [Line Items]
Margin percentage				2.50%
Revolving Credit Facility \| A&E Cash Flow Credit Facilities \| Line of Credit
Line of Credit Facility [Line Items]
Unused line fee percentage				0.50%
Letter of credit fronting fee percentage				0.125%
Fees on unutilized commitments											$ 758
Revolving Credit Facility \| A&E Term Loan Facility \| Line of Credit
Line of Credit Facility [Line Items]
Proceeds from issuance of secured debt								$ 1,317,000
Revolving Credit Facility \| Non-Extended Cash Flow Revolver Facility \| Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity														$ 38,750
Borrowing capacity available	$ 38,750									$ 38,750	38,750
Amount outstanding	0									0	0
Revolving Credit Facility \| Non-Extended Cash Flow Revolver Facility \| Line of Credit \| Base Rate
Line of Credit Facility [Line Items]
Margin percentage				3.00%
Revolving Credit Facility \| Non-Extended Cash Flow Revolver Facility \| Line of Credit \| Term SOFR
Line of Credit Facility [Line Items]
Margin percentage				4.00%
Revolving Credit Facility \| A&E Cash Flow Revolving Facility \| Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity														$ 111,250
Borrowing capacity available	111,250									111,250	111,250
Amount outstanding	$ 0									$ 0	$ 0
Revolving Credit Facility \| A&E Cash Flow Revolving Facility \| Line of Credit \| Base Rate
Line of Credit Facility [Line Items]
Margin percentage				3.00%
Revolving Credit Facility \| A&E Cash Flow Revolving Facility \| Line of Credit \| Term SOFR
Line of Credit Facility [Line Items]
Margin percentage				4.00%