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7. FINANCIAL INSTRUMENTS - Other information (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Mar. 31, 2020
Other information |  |
Maximum maturity period of investment portfolio | 3 years |
Deferred tax liability related to unrecognized gains and losses on short-term and long-term investments | $ 22,000 | $ 30,000

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

X
- References No definition available. + Details
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X
- Definition Amount of deferred tax liability attributable to taxable temporary differences from investments (excludes investments in subsidiaries and equity method investments). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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