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Discontinued Operations - Financial Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Mar. 28, 2015
Mar. 29, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Rental and direct sale revenue from discontinued operations   $ 208us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue   $ 17,844us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Loss before income taxes   (418)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss   (279)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
Loss, net of tax   (227)gk_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLossNetofTax   (141)gk_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLossNetofTax
Income (Loss) on sale and other adjustments, net of tax   46us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax (8,252)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax (8,252)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Net income (Loss) from discontinued operations 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (181)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (8,393)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax     12,837us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax  
Income tax benefit     4,585us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation  
Program business        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loss in excess of carrying value of Program Business     (11,559)gk_DiscontinuedOperationGainLossinExcessofCarryingValuefromDisposalofDiscontinuedOperationbeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= gk_ProgramBusinessMember
 
Transaction and related costs     (675)gk_DiscontinuedOperationGainLossofTransactionandRelatedCostsfromDisposalofDiscontinuedOperationbeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= gk_ProgramBusinessMember
 
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax     12,234us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= gk_ProgramBusinessMember
 
Ireland business        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax     $ 603us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= gk_IrelandBusinessMember