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Long-Term Debt - Amount of Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Jun. 28, 2014
Debt Instrument [Line Items]    
Borrowings under $250M Revolver $ 40,060us-gaap_LineOfCredit $ 65,925us-gaap_LineOfCredit
Borrowings under $50M A/R Line 25,075us-gaap_SecuredDebt 25,075us-gaap_SecuredDebt
Capital leases and other 508us-gaap_CapitalLeaseObligations 1,022us-gaap_CapitalLeaseObligations
Long-term debt including current maturities 240,643us-gaap_DebtAndCapitalLeaseObligations 267,022us-gaap_DebtAndCapitalLeaseObligations
Less current maturities (560)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent (792)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Total long-term debt 240,083us-gaap_LongTermDebtAndCapitalLeaseObligations 266,230us-gaap_LongTermDebtAndCapitalLeaseObligations
Variable interest rate [Member]    
Debt Instrument [Line Items]    
Borrowings under $75M Variable Rate Notes and $100M Fixed Rate Notes 75,000us-gaap_UnsecuredDebt
/ gk_InteresttypeAxis
= gk_VariableinterestrateMember
75,000us-gaap_UnsecuredDebt
/ gk_InteresttypeAxis
= gk_VariableinterestrateMember
Fixed interest rate [Member]    
Debt Instrument [Line Items]    
Borrowings under $75M Variable Rate Notes and $100M Fixed Rate Notes $ 100,000us-gaap_UnsecuredDebt
/ gk_InteresttypeAxis
= gk_FixedinterestrateMember
$ 100,000us-gaap_UnsecuredDebt
/ gk_InteresttypeAxis
= gk_FixedinterestrateMember