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Balance Sheet Components (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Aug. 31, 2013
Inventories          
Raw materials $ 2,216   $ 2,216   $ 2,193
Work in process 2,864   2,864   3,865
Finished goods 5,729   5,729   4,442
Total 10,809   10,809   10,500
Inventory write-downs 550 496 737 1,208  
Property, Plant and Equipment          
Total property, plant and equipment 88,564   88,564   88,477
Less: Accumulated depreciation, amortization and impairment (60,180)   (60,180)   (58,004)
Property, plant and equipment, net 28,384   28,384   30,473
Buildings and improvements
          
Property, Plant and Equipment          
Total property, plant and equipment 14,327   14,327   14,510
Machinery and equipment
          
Property, Plant and Equipment          
Total property, plant and equipment 66,727   66,727   67,109
Leasehold improvements
          
Property, Plant and Equipment          
Total property, plant and equipment 3,115   3,115   3,144
Other equipment
          
Property, Plant and Equipment          
Total property, plant and equipment 2,696   2,696   2,686
Construction in progress
          
Property, Plant and Equipment          
Total property, plant and equipment $ 1,699   $ 1,699   $ 1,028