XML 13 R39.htm IDEA: XBRL DOCUMENT v2.4.1.9
Derivative Financial Instruments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Dec. 27, 2014
Jun. 28, 2014
Derivative Instruments, Gain (Loss) [Line Items]    
Percentage of outstanding variable rate debt modified 54.00%gk_PercentageOfOutstandingVariableRateDebtModified  
Net gain deferred in accumulated other comprehensive income $ 1,211us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax  
Loss expected to be reclassified to interest expense 208us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths  
Accrued Expenses [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Liabilities on interest rate swap contracts 562us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= gk_AccruedExpensesMember
930us-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
 
Notional amount of interest rate swap contracts $ 75,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
 
Interest rate swap contracts | Maximum    
Derivative Instruments, Gain (Loss) [Line Items]    
Maturity period of notional amount of interest rate swaps (in months) 12 months