Name:	gsit_EmployeeStockPurchasePlanMaximumAnnualRightsToPurchase
Namespace Prefix:	gsit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the number of shares per month used to calculate the maximum number of shares an employee can purchase in an offering period.

No definition available.

Name:	gsit_EmployeeStockPurchasePlanMaximumSharePurchaseMultiplier
Namespace Prefix:	gsit_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Represents the percentage which employees must own less than in order to qualify for the Employee Stock Purchase Plan (ESPP).

No definition available.

Name:	gsit_EmployeeStockPurchasePlanMaximumStockOwnershipToQualify
Namespace Prefix:	gsit_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the value per month used to calculate the maximum number of shares an employee can purchase in an offering period.

No definition available.

Name:	gsit_EmployeeStockPurchasePlanMaximumValueMultiplier
Namespace Prefix:	gsit_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Represents the minimum number of per week an employee needs to work to qualify for the Employee Stock Purchase Plan.

No definition available.

Name:	gsit_EmployeeStockPurchasePlanMinimumHoursPerWeekToQualify
Namespace Prefix:	gsit_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the minimum number of months per year needed to work for employees to qualify for the Employee Stock Purchase Plan.

No definition available.

Name:	gsit_EmployeeStockPurchasePlanMinimumMonthsPerYearToQualify
Namespace Prefix:	gsit_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The offering period of the Employee Stock Purchase Plan.

No definition available.

Name:	gsit_EmployeeStockPurchasePlanOfferingPeriod
Namespace Prefix:	gsit_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the value divided by the fair market value of a share of the Company's stock determined on the last trading day immediately preceding the date on which the applicable nonemployee award is granted.

No definition available.

Name:	gsit_MaximumTotalFairMarketValueOfShare
Namespace Prefix:	gsit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the maximum amount of shares subject to cash-based share awards and other stock-based awards that can be granted to an employee in any fiscal year.

No definition available.

Name:	gsit_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAnnualCashBasedAndOtherStockBasedShareAwardsPerEmployee
Namespace Prefix:	gsit_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Represents the maximum amount of shares subject to performance share awards that can be granted to an employee in any fiscal year.

No definition available.

Name:	gsit_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAnnualPerformanceShareAwardsPerEmployee
Namespace Prefix:	gsit_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Represents the maximum amount subject to cash-based or other stock-based unit awards that can be granted to an employee in any fiscal year.

No definition available.

Name:	gsit_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAnnualValueCashBasedAndOtherStockBasedAwardsGrantedPerEmployee
Namespace Prefix:	gsit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the maximum amount subject to performance unit awards that can be granted to an employee in any fiscal year.

No definition available.

Name:	gsit_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAnnualValuePerformanceUnitAwardsGrantedPerEmployee
Namespace Prefix:	gsit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the maximum annual percentage increase in the plan shares authorized reserve.

No definition available.

Name:	gsit_SharebasedCompensationArrangementBySharebasedPaymentAwardMaximumAnnualPercentageIncreasePlanReserve
Namespace Prefix:	gsit_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the maximum amount of shares subject to restricted stock and restricted stock unit awards that can be granted to an employee in any fiscal year.

No definition available.

Name:	gsit_SharebasedCompensationArrangementBySharebasedPaymentAwardMaximumAnnualRestrictedStockAndRestrictedStockUnitAwardsGrantedPerEmployee
Namespace Prefix:	gsit_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Represents the maximum annual share increase in the plan shares authorized reserve.

No definition available.

Name:	gsit_SharebasedCompensationArrangementBySharebasedPaymentAwardMaximumAnnualShareIncreasePlanReserve
Namespace Prefix:	gsit_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Represents the maximum amount of shares subject to stock options and stock appreciation rights that can be granted to an employee in any fiscal year.

No definition available.

Name:	gsit_SharebasedCompensationArrangementBySharebasedPaymentAwardMaximumAnnualStockOptionAndStockAppreciationRightsGrantedPerEmployee
Namespace Prefix:	gsit_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Represents the number of shares that were previously authorized and reserved for issuance under the Equity Plan that have been cancelled.

No definition available.

Name:	gsit_SharebasedCompensationArrangementBySharebasedPaymentAwardPreviouslyAuthorizedSharesCancelled
Namespace Prefix:	gsit_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Aggregate number of common shares reserved for future issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Number of shares authorized for issuance under share-based payment arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Gross number of share options (or share units) granted during the period.

No definition available.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Number of shares issued under share-based payment arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Percentage of vesting of award under share-based payment arrangement.

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Purchase price of common stock expressed as a percentage of its fair value.

No definition available.

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_PlanNameAxis=gsit_EquityIncentivePlanYear2007Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_TitleOfIndividualAxis=gsit_NonOfficerEmployeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_TitleOfIndividualAxis=srt_OfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PlanNameAxis=gsit_EquityIncentivePlan2016Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_TitleOfIndividualAxis=srt_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PlanNameAxis=gsit_EmployeeStockPurchasePlanYear2007Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: