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12. EMPLOYEE BENEFIT PLANS (Details) | 12 Months Ended
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Mar. 31, 2017
Taiwan |
Maximum amount employee can contribute (as a percent) | 6.00%
Maximum amount employer can contribute (as a percent) | 6.00%
Retirement Plan | United States |
Maximum amount employee can contribute (as a percent) | 15.00%
Pension Plan | Israel |
Maximum amount employee can contribute (as a percent) | 5.00%
Maximum amount employer can contribute (as a percent) | 15.83%

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_TW
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PlanNameAxis=gsit_RetirementPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PlanNameAxis=gsit_PensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_IL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |