0001564590-21-057063 | 10-Q | XBRL Viewer

Deferred Underwriting Compensation - Additional Information (Details)	Sep. 30, 2021 USD ($)
Deferred Underwriting Compensation [Abstract]
Deferred underwriting discount if business combination not completed	$ 0

Label	Element	Value
Adjustments To Additional Paid In Capital Excess Of Fair Value Paid By Founders For Warrants	gmii_AdjustmentsToAdditionalPaidInCapitalExcessOfFairValuePaidByFoundersForWarrants	$ (1,045,000)
Adjustments To Additional Paid In Capital Excess Of Fair Value Paid By Founders For Warrants	gmii_AdjustmentsToAdditionalPaidInCapitalExcessOfFairValuePaidByFoundersForWarrants	(1,045,000)
Deferred Underwriting Compensation	gmii_DeferredUnderwritingCompensation	15,750,000
Annual Limit Of Regulatory Withdrawal	gmii_AnnualLimitOfRegulatoryWithdrawal	$ 900,000
Number Of Shares Contribute Each Unit	gmii_NumberOfSharesContributeEachUnit	0.20
Number Of Shares Contribute Each Unit	gmii_NumberOfSharesContributeEachUnit	1
Cash Paid For Income And State Franchise Taxes	gmii_CashPaidForIncomeAndStateFranchiseTaxes	$ 2,918
Funds Held In Trust Account Maturity Description	gmii_FundsHeldInTrustAccountMaturityDescription	Funds held in the Trust Account can be invested only in U.S. government treasury bills with a maturity of one hundred and eighty-five (185) days or less or in money market funds meeting certain conditions under Rule 2a‑7 under the Investment Company Act of 1940, as amended, that invest only in direct U.S. government obligations.
Net Income Loss Including Accretion Of Temporary Equity	gmii_NetIncomeLossIncludingAccretionOfTemporaryEquity	$ (4,706,930)
Net Income Loss Including Accretion Of Temporary Equity	gmii_NetIncomeLossIncludingAccretionOfTemporaryEquity	(1,176,733)
Net Income Loss Including Accretion Of Temporary Equity	gmii_NetIncomeLossIncludingAccretionOfTemporaryEquity	(21,745)
Net Income Loss Including Accretion Of Temporary Equity	gmii_NetIncomeLossIncludingAccretionOfTemporaryEquity	(36,043,721)
Net Income Loss Including Accretion Of Temporary Equity	gmii_NetIncomeLossIncludingAccretionOfTemporaryEquity	$ (9,813,491)
Threshold Period To Complete Business Combination From Closing Of Public Offering	gmii_ThresholdPeriodToCompleteBusinessCombinationFromClosingOfPublicOffering	24 months
Threshold Period To Complete Business Combination From Closing Of Public Offering	gmii_ThresholdPeriodToCompleteBusinessCombinationFromClosingOfPublicOffering	24 months
Threshold Period To Complete Business Combination From Closing Of Public Offering	gmii_ThresholdPeriodToCompleteBusinessCombinationFromClosingOfPublicOffering	24 months
Issuance Costs Related To Warrant Liabilities	gmii_IssuanceCostsRelatedToWarrantLiabilities	$ 918,141
Payment Of Underwriters Discounts And Commissions	gmii_PaymentOfUnderwritersDiscountsAndCommissions	9,000,000
Working Capital	gmii_WorkingCapital	(29,106,723)
Working Capital	gmii_WorkingCapital	(14,918)
Sale Of Common Stock Value To Sponsor	gmii_SaleOfCommonStockValueToSponsor	1,150
Sale Of Common Stock Value To Sponsor	gmii_SaleOfCommonStockValueToSponsor	23,850
Sale Of Common Stock Value To Sponsor	gmii_SaleOfCommonStockValueToSponsor	25,000
Adjustments To Additional Paid In Capital Subsequent Measurement Of Class A Common Stock	gmii_AdjustmentsToAdditionalPaidInCapitalSubsequentMeasurementOfClassACommonStock	1,068,875
Adjustments To Additional Paid In Capital Subsequent Measurement Of Class A Common Stock	gmii_AdjustmentsToAdditionalPaidInCapitalSubsequentMeasurementOfClassACommonStock	1,068,875
Issuance Costs Related To Warrant Liability	gmii_IssuanceCostsRelatedToWarrantLiability	$ 918,141
Warrant Exercisable Term If Business Combination Is Completed	gmii_WarrantExercisableTermIfBusinessCombinationIsCompleted	30 days
Regulatory Withdrawal Of Interest From Trust Account Maximum Period	gmii_RegulatoryWithdrawalOfInterestFromTrustAccountMaximumPeriod	24 months
Accrual For State Franchise Taxes Current	gmii_AccrualForStateFranchiseTaxesCurrent	$ 150,000
Accrual For State Franchise Taxes Current	gmii_AccrualForStateFranchiseTaxesCurrent	2,918
Payments To Interest And Dividends Reinvested In Trust Account	gmii_PaymentsToInterestAndDividendsReinvestedInTrustAccount	$ 29,593
Warrant Exercisable Term From Closing Of Public Offer	gmii_WarrantExercisableTermFromClosingOfPublicOffer	12 months
Common Stock Subject To Cancelation Upon Agreement Without Consideration	gmii_CommonStockSubjectToCancelationUponAgreementWithoutConsideration	1,277,285
Underwriters Fees	gmii_UnderwritersFees	$ 24,750,000
Subsequent Measurement Of Class A Common Stock Subject To Redemption Against Accumulated Deficit	gmii_SubsequentMeasurementOfClassACommonStockSubjectToRedemptionAgainstAccumulatedDeficit	39,666,004
Subsequent Measurement Of Class A Common Stock Subject To Redemption Against Accumulated Deficit	gmii_SubsequentMeasurementOfClassACommonStockSubjectToRedemptionAgainstAccumulatedDeficit	$ 39,666,004
Description For Trust Account Utilization For Business Combination	gmii_DescriptionForTrustAccountUtilizationForBusinessCombination	the Company does not complete the Business Combination within 24 months from the closing of the Public Offering; or (iii) the redemption of 100% of the public shares of common stock if the Company is unable to complete a Business Combination within 24 months from the closing of the Public Offering
Professional Fees And Other Expenses	gmii_ProfessionalFeesAndOtherExpenses	$ 1,495,007
Professional Fees And Other Expenses	gmii_ProfessionalFeesAndOtherExpenses	20,500
Professional Fees And Other Expenses	gmii_ProfessionalFeesAndOtherExpenses	5,678,785
Promissory Note Issued	gmii_PromissoryNoteIssued	1,500,000
Promissory Note Issued	gmii_PromissoryNoteIssued	1,000,000
Proceeds From Sale Of Common Stock	gmii_ProceedsFromSaleOfCommonStock	25,000
Increase Decrease In State Franchise Tax Accrual	gmii_IncreaseDecreaseInStateFranchiseTaxAccrual	147,082
Increase Decrease In State Franchise Tax Accrual	gmii_IncreaseDecreaseInStateFranchiseTaxAccrual	$ 1,245
Term Of Option To Purchase Additional Units To Cover Over Allotment	gmii_TermOfOptionToPurchaseAdditionalUnitsToCoverOverAllotment	45 days
Shares Transferred To Independent Directors	gmii_SharesTransferredToIndependentDirectors	25,000
Adjustments To Additional Paid In Capital Forfeited Common Stock By Sponsor	gmii_AdjustmentsToAdditionalPaidInCapitalForfeitedCommonStockBySponsor	$ 25
Adjustments To Additional Paid In Capital Forfeited Common Stock By Sponsor	gmii_AdjustmentsToAdditionalPaidInCapitalForfeitedCommonStockBySponsor	$ (25)
Business Combination Additional Number Of Earnout Shares	gmii_BusinessCombinationAdditionalNumberOfEarnoutShares	14,500,000
Shares Forfeited	gmii_SharesForfeited	250,000
Number Of Votes For Each Share	gmii_NumberOfVotesForEachShare	1
Offering Costs Related To Warrant Liability	gmii_OfferingCostsRelatedToWarrantLiability	$ 918,141
Proceeds From Promissory Note Issued	gmii_ProceedsFromPromissoryNoteIssued	1,500,000
Deferred Offering Costs Paid	gmii_DeferredOfferingCostsPaid	$ 106,248
Forfeited Common Stock By Sponsor	gmii_ForfeitedCommonStockBySponsor	250,000
Threshold Net Tangible Assets For Redemption Of Public Shares	gmii_ThresholdNetTangibleAssetsForRedemptionOfPublicShares	$ 5,000,001
Threshold Net Tangible Assets For Redemption Of Public Shares	gmii_ThresholdNetTangibleAssetsForRedemptionOfPublicShares	5,000,001
Increase Decrease In Accrued Expenses Formation And Offering Costs	gmii_IncreaseDecreaseInAccruedExpensesFormationAndOfferingCosts	4,250,969
Increase Decrease In Accrued Expenses Formation And Offering Costs	gmii_IncreaseDecreaseInAccruedExpensesFormationAndOfferingCosts	$ 4,000
Shares Agreed To Surrender Under Share Surrender Agreement	gmii_SharesAgreedToSurrenderUnderShareSurrenderAgreement	1,277,285
Number Of Warrants Exercised	gmii_NumberOfWarrantsExercised	0
Dissolution Expenses Maximum Allowed	gmii_DissolutionExpensesMaximumAllowed	$ 100,000
Sale Of Common Stock Shares To Sponsor	gmii_SaleOfCommonStockSharesToSponsor	11,500,000
Proceeds Allocated To Public Warrants	gmii_ProceedsAllocatedToPublicWarrants	$ 16,290,000
Expected Payment Of Deferred Underwriting Discount	gmii_ExpectedPaymentOfDeferredUnderwritingDiscount	15,750,000
Payment Of Upfront Underwriting Discount	gmii_PaymentOfUpfrontUnderwritingDiscount	$ 9,000,000
Going Concern Description	gmii_GoingConcernDescription	If the Company does not complete its Business Combination by January 22, 2023, the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than ten business days thereafter, redeem 100% of the common stock sold as part of the units in the Public Offering, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest (which interest shall be net of franchise and income taxes payable and less up to $100,000 of such net interest which may be distributed to the Company to pay dissolution expenses), divided by the number of then outstanding public shares, which redemption will completely extinguish public stockholders’ rights as stockholders (including the right to receive further liquidation distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the Company’s remaining stockholders and the Company’s Board of Directors, dissolve and liquidate, subject in each case to the Company’s obligations under Delaware law to provide for claims of creditors and the requirements of other applicable law.
Due To Affiliate Monthly	gmii_DueToAffiliateMonthly	$ 20,000
Payment To Cash Deposited In Trust Account	gmii_PaymentToCashDepositedInTrustAccount	$ 450,000,000

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