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9. COMMITMENTS AND CONTINGENCIES - Product warranties (Details) | 9 Months Ended
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Dec. 31, 2020
Product warranties |
Warranty period | 3 years

X
- Definition Represents the period for which the entity warranties its products. + References No definition available. + Details
Name: | gsit_WarrantyPeriod
Namespace Prefix: | gsit_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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