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Inventory and Merchandise In Service - Additional Information (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 29, 2014
Mar. 29, 2014
Inventory Disclosure [Abstract]    
Effect of change in inventory lives on income from operations $ 1,270gk_Effectofchangeininventorylivesonincomefromoperations $ 5,346gk_Effectofchangeininventorylivesonincomefromoperations
Effect of change in inventory lives on net income $ 806gk_Effectofchangeininventorylivesonnetincome $ 3,366gk_Effectofchangeininventorylivesonnetincome
Effect of change in inventory lives on earnings per share (in dollars per share) $ 0.04gk_EffectofChangeinInventoryLivesonEarningsPerShare $ 0.17gk_EffectofChangeinInventoryLivesonEarningsPerShare