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7. FINANCIAL INSTRUMENTS - Other information (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Mar. 31, 2023
Other information |  |
Maximum maturity period of investment portfolio | 3 years |
Deferred tax asset related to unrecognized gains and losses on short-term and long-term investments | $ 1,000 | $ 10,000

X
- Definition Represents the maximum maturity period of investments. + References No definition available. + Details
Name: | gsit_MaximumMaturityPeriodOfInvestments
Namespace Prefix: | gsit_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from investments (excludes investments in subsidiaries and equity method investments). + References No definition available. + Details
Name: | us-gaap_DeferredTaxAssetsInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant