Commitments and Contingencies - Related Party Transactions (Details)

v3.25.3

Commitments and Contingencies - Related Party Transactions (Details)		3 Months Ended		6 Months Ended
	Dec. 07, 2023 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)
Selling, General and Administrative Expense
Selling, general and administrative		$ 6,794,000	$ 6,400,000	$ 13,715,000	$ 13,183,000
Affiliated Entity
Selling, General and Administrative Expense
Percentage of PrivateCo's income (as a percent)	90
Other income		600,000	700,000	1,000,000	1,300,000
Affiliated Entity \| Capstone Green Energy Corporation (Reorganized PrivateCo)
Selling, General and Administrative Expense
Related party transaction, annual royalty payment	$ 100,000
Affiliated Entity \| Capstone Green Energy LLC (Operating Subsidiary)
Selling, General and Administrative Expense
Services fee	$ 2,500,000
Services fee cap threshold incremental percentage (as a percent)	3.50%
Services fee cap incremental percentage (as a percent)	1.75%
Immediate Family Member of Management or Principal Owner
Selling, General and Administrative Expense
Selling, general and administrative		300,000	$ 300,000	700,000	$ 600,000
Related party transaction, estimated potential bonus		$ 0		$ 0

- Definition

Percentage of Reorganized Private Co Income Being a Service Fee Paid In Cash

+ References

No definition available.

+ Details

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Namespace Prefix:	cgeh_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction, Annual Royalty Payment

+ References

No definition available.

+ Details

Name:	cgeh_RelatedPartyTransactionAnnualRoyaltyPayment
Namespace Prefix:	cgeh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Related Party Transaction, Estimated Potential Bonus

+ References

No definition available.

+ Details

Name:	cgeh_RelatedPartyTransactionEstimatedPotentialBonus
Namespace Prefix:	cgeh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Service Agreement, Services Fee Cap, Amount

+ References

No definition available.

+ Details

Name:	cgeh_ServiceAgreementServicesFeeCapAmount
Namespace Prefix:	cgeh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Service Agreement, Services Fee Cap, Incremental, Percentage

+ References

No definition available.

+ Details

Name:	cgeh_ServiceAgreementServicesFeeCapIncrementalPercentage
Namespace Prefix:	cgeh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Service Agreement, Services Fee Cap, Threshold Incremental, Percentage

+ References

No definition available.

+ Details

Name:	cgeh_ServiceAgreementServicesFeeCapThresholdIncrementalPercentage
Namespace Prefix:	cgeh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of income related to nonoperating activities, classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

+ Details

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

- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-18

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-11

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-4

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-14

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-6

+ Details

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

- References

No definition available.

+ Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=cgeh_CapstoneGreenEnergyCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=cgeh_CapstoneGreenEnergyLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Quarterly report [Sections 13 or 15(d)]

Commitments and Contingencies - Related Party Transactions (Details)