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Inventories - Schedule of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2012
Aug. 31, 2012
Schedule Of Inventory [Line Items]    
Product held at third-party contract manufacturers $ 3,688 $ 4,142
Raw materials and components 4,978 4,093
Work-in-process 360 347
Finished goods 21,741 21,215
Total $ 30,767 $ 29,797