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Income Tax - Schedule of Movements of the Valuation Allowance (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Schedule Of Movements Of The Valuation Allowance Abstract |  |
Balance at beginning | $ 7,916 | $ 5,874
Balance at ending | 199,508 | 7,916
Allowance made during the year | 195,252 | 7,916
Foreign exchange difference | $ (3,660) |
Decrease due to dissolution |  | $ (5,874)

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- Definition Represent the amount of deferred tax assets valuation allowance decrease due to dissolution. + References No definition available. + Details
Name: | gcl_DeferredTaxAssetsValuationAllowanceDecreaseDueToDissolution
Namespace Prefix: | gcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represent the amount of deferred tax assets valuation allowance foreign exchange difference. + References No definition available. + Details
Name: | gcl_DeferredTaxAssetsValuationAllowanceForeignExchangeDifference
Namespace Prefix: | gcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represent the amount of deferred tax assets valuation allowance made during the year. + References No definition available. + Details
Name: | gcl_DeferredTaxAssetsValuationAllowanceMadeDuringTheYear
Namespace Prefix: | gcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | gcl_ScheduleOfMovementsOfTheValuationAllowanceAbstract
Namespace Prefix: | gcl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant