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COMMITMENTS AND CONTINGENCIES (Details 2) (USD $)
 12 Months Ended
Aug. 02, 2014
Inventories  
Purchase commitment  
Outstanding purchase commitments $ 29,400,000us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember
Diesel fuel  
Purchase commitment  
Outstanding purchase commitments $ 32,551,000us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_FuelMember