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Other Assets and Other Noncurrent Liabilities - Other Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Jun. 28, 2014
Other Assets [Abstract]    
Executive deferred compensation plan assets $ 33,561us-gaap_DeferredCompensationPlanAssets $ 32,667us-gaap_DeferredCompensationPlanAssets
Cash surrender value of life insurance policies 14,492us-gaap_CashSurrenderValueOfLifeInsurance 14,287us-gaap_CashSurrenderValueOfLifeInsurance
Customer contracts, net 5,420us-gaap_FiniteLivedIntangibleAssetsNet 6,448us-gaap_FiniteLivedIntangibleAssetsNet
Other assets 10,674us-gaap_OtherAssetsMiscellaneous 10,603us-gaap_OtherAssetsMiscellaneous
Less portion classified as current assets (2,657)gk_Noncurrentassetsportionclassifiedascurrent (2,177)gk_Noncurrentassetsportionclassifiedascurrent
Total other assets $ 61,490us-gaap_OtherAssetsNoncurrent $ 61,828us-gaap_OtherAssetsNoncurrent