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Components of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Jul. 31, 2014
Inventory [Line Items]    
Raw materials $ 58,184us-gaap_InventoryRawMaterialsNetOfReserves $ 51,179us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 567us-gaap_InventoryWorkInProcessNetOfReserves 910us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 6,995us-gaap_InventoryFinishedGoodsNetOfReserves 13,180us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories, net $ 65,746us-gaap_InventoryNet $ 65,269us-gaap_InventoryNet