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Derivative Financial Instruments - Additional Information (Detail) (USD $)
9 Months Ended
Mar. 28, 2015
Jun. 28, 2014
Derivative Instruments, Gain (Loss) [Line Items]    
Percentage of outstanding variable rate debt modified 58.00%gk_PercentageOfOutstandingVariableRateDebtModified  
Net gain deferred in accumulated other comprehensive income $ 1,290,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax  
Loss expected to be reclassified to interest expense 91,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths  
Accrued expenses    
Derivative Instruments, Gain (Loss) [Line Items]    
Liabilities on interest rate swap contracts 374,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= gk_AccruedExpensesMember
930,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= gk_AccruedExpensesMember
Interest rate swap contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Average rate on interest rate swap contracts 1.25%us-gaap_DerivativeAverageFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
 
Maturity period of notional amount of interest rate swaps (in months) 12 months  
Notional amount of interest rate swap contracts $ 75,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember