Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Guarantee balance for project implementation fees	$ 9.9	$ 3.8

Guarantee balance for project implementation fees.

No definition available.

Name:	giga_GuaranteeBalanceForProjectImplementationFees
Namespace Prefix:	giga_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant