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Schedule of Restructuring, Acquisition and Divestiture Related Costs (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Restructuring Cost And Reserve [Line Items]    
Restructuring charges $ 1,753us-gaap_RestructuringCharges $ 28us-gaap_RestructuringCharges
Acquisition and divestiture related charges 684gsig_AcquisitionAndDivestitureRelatedCharges 790gsig_AcquisitionAndDivestitureRelatedCharges
Restructuring, acquisition and divestiture related costs 2,437gsig_RestructuringChargesAcquisitionAndDivestureRelatedCosts 818gsig_RestructuringChargesAcquisitionAndDivestureRelatedCosts
JADAK Acquisition | Earn-out Agreement    
Restructuring Cost And Reserve [Line Items]    
Recognized acquisition costs (80)us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= gsig_JADAKMember
/ us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis
= gsig_EarnOutAgreementMember
87us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= gsig_JADAKMember
/ us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis
= gsig_EarnOutAgreementMember
Acquisition Charges    
Restructuring Cost And Reserve [Line Items]    
Recognized acquisition costs 207us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ gsig_AcquisitionRelatedCostAxis
= us-gaap_AcquisitionRelatedCostsMember
703us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ gsig_AcquisitionRelatedCostAxis
= us-gaap_AcquisitionRelatedCostsMember
2011 Restructuring    
Restructuring Cost And Reserve [Line Items]    
Restructuring charges 383us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= gsig_FiscalYearTwentyElevenMember
28us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= gsig_FiscalYearTwentyElevenMember
2015 Restructuring    
Restructuring Cost And Reserve [Line Items]    
Restructuring charges 1,370us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= gsig_FiscalYearTwentyFifteenMember
 
JK Laser Divesture Charges    
Restructuring Cost And Reserve [Line Items]    
JK Lasers divestiture related charges $ 557us-gaap_BusinessExitCosts1
/ us-gaap_RestructuringCostAndReserveAxis
= gsig_JKLasersDivestureRelatedChargesMember