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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 6 Months Ended
Dec. 28, 2013
Dec. 28, 2013
Inventory Disclosure [Abstract]    
Effect of change in inventory lives on income from operations $ 1,803gk_Effectofchangeininventorylivesonincomefromoperations $ 4,076gk_Effectofchangeininventorylivesonincomefromoperations
Effect of change in inventory lives on net income $ 1,125gk_Effectofchangeininventorylivesonnetincome $ 2,560gk_Effectofchangeininventorylivesonnetincome
Effect of change in inventory lives on earnings per share (in dollars per share) $ 0.06gk_EffectofChangeinInventoryLivesonEarningsPerShare $ 0.13gk_EffectofChangeinInventoryLivesonEarningsPerShare