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Leases - Schedule of Sublease Income Payments Under Operating Leases (Details)	Dec. 31, 2025 USD ($)
Schedule of Sublease Income Payments Under Operating Leases [Abstract]
FY2026	$ 425,218
FY2027	400,461
FY2028	408,471
FY2029	69,209
Total sublease receivable	1,303,359
Less: imputed interest	147,481
Present value of sublease income	$ 1,155,878

X

- Definition

Amount of lessee's undiscounted obligation for subleaselease income for operating lease.

+ References

No definition available.

+ Details

Name:	gdc_LesseeOperatingLeaseLiabilitySubleaseIncomeDue
Namespace Prefix:	gdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's undiscounted obligation for Sublease income for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	gdc_LesseeOperatingLeaseLiabilitySubleaseIncomeDueNextTwelveMonths
Namespace Prefix:	gdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's undiscounted obligation for sublease income for operating lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	gdc_LesseeOperatingLeaseLiabilitySubleaseIncomeDueYearFive
Namespace Prefix:	gdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's undiscounted obligation for sublease income for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	gdc_LesseeOperatingLeaseLiabilitySubleaseIncomeDueYearThree
Namespace Prefix:	gdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's undiscounted obligation for sublease income for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	gdc_LesseeOperatingLeaseLiabilitySubleaseIncomeDueYearTwo
Namespace Prefix:	gdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's undiscounted obligation for sublease income in excess of discounted obligation for sublease income for operating lease.

+ References

No definition available.

+ Details

Name:	gdc_LesseeOperatingLeaseLiabilitySubleaseIncomeUndiscountedExcessAmount
Namespace Prefix:	gdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Present value of lessee's discounted obligation for sublease income from operating lease.

+ References

No definition available.

+ Details

Name:	gdc_OperatingLeaseLiabilitySubleaseIncome
Namespace Prefix:	gdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	gdc_ScheduleOfSubleaseIncomePaymentsUnderOperatingLeasesAbstract
Namespace Prefix:	gdc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration