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Summary of Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jan. 31, 2015
Jul. 31, 2014
Property, Plant and Equipment [Line Items]    
Equipment spares 38,195us-gaap_PropertyPlantAndEquipmentOther 45,572us-gaap_PropertyPlantAndEquipmentOther
Machinery, equipment and internally manufactured systems 42,112us-gaap_MachineryAndEquipmentGross 43,388us-gaap_MachineryAndEquipmentGross
Land 8,641us-gaap_Land 8,152us-gaap_Land
Building 10,668us-gaap_BuildingsAndImprovementsGross 11,157us-gaap_BuildingsAndImprovementsGross
Office furniture and equipment 2,765us-gaap_FixturesAndEquipmentGross 3,209us-gaap_FixturesAndEquipmentGross
Purchased software 457us-gaap_CapitalizedComputerSoftwareGross 455us-gaap_CapitalizedComputerSoftwareGross
Leasehold improvements 10,339us-gaap_LeaseholdImprovementsGross 7,414us-gaap_LeaseholdImprovementsGross
Property and equipment, gross 113,177us-gaap_PropertyPlantAndEquipmentGross 119,347us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation and amortization (72,555)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (78,464)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 40,622us-gaap_PropertyPlantAndEquipmentNet 40,883us-gaap_PropertyPlantAndEquipmentNet
Minimum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment estimated useful life 3 years 3 years
Maximum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment estimated useful life 7 years 7 years
Equipment spares | Minimum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment estimated useful life 5 years  
Equipment spares | Maximum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment estimated useful life 7 years  
Machinery, equipment and internally manufactured systems | Minimum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment estimated useful life 3 years  
Machinery, equipment and internally manufactured systems | Maximum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment estimated useful life 7 years  
Building | Minimum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment estimated useful life 10 years  
Building | Maximum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment estimated useful life 40 years  
Office furniture and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment estimated useful life 3 years  
Office furniture and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment estimated useful life 8 years  
Purchased software    
Property, Plant and Equipment [Line Items]    
Property plant and equipment estimated useful life 3 years  
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property plant and equipment useful life Lesser of lease term or useful life, not to exceed 10 years  
Leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment estimated useful life 10 years