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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Aug. 31, 2011
May 31, 2011
Feb. 28, 2011
Nov. 30, 2010
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Income Taxes              
Statutory income tax rate in Taiwan (as a percent)         17.00%    
Additional Taiwan corporate income tax rate (as a percent)         10.00%    
Income (loss) before income taxes              
U.S. operations         $ (17,361) $ (5,342) $ (625)
Foreign operations         (32,588) (10,071) 11,720
Income (loss) before income taxes         (49,949) (15,413) 11,095
Current:              
Foreign           38 851
Total current           38 851
Deferred:              
Foreign           687 (584)
Total deferred           687 (584)
Total income tax expense 678 (10) (219) 276   725 267
U.S. federal income tax rate (as a percent)         34.00% 34.00% 34.00%
Reconciliation of income tax expense              
Computed "expected" income tax expense (benefit)         (16,983) (5,240) 3,772
Foreign tax rate differential         2,487 586 (1,920)
Decrease (increase) in investment credits           (1,907) 43
Valuation allowance         14,089 7,179 (1,628)
Other         407 107  
Total income tax expense 678 (10) (219) 276   725 267
Deferred tax assets:              
Inventories, primarily due to inventory obsolescence and lower of cost or market provisions 1,303       1,810 1,303  
Income tax credits 2,962       1,912 2,962  
Allowance for doubtful accounts 236       362 236  
Accruals and other 134       171 134  
Property, plant and equipment 12       1,292 12  
Stock-based compensation 405       651 405  
Foreign investment loss 942       5,506 942  
Net operating loss carryforwards 3,633       11,522 3,633  
Total gross deferred tax assets 9,627       23,226 9,627  
Less: Valuation allowance (9,346)       (22,474) (9,346)  
Deferred tax assets, net of valuation allowance 281       752 281  
Deferred tax liabilities:              
Property, plant and equipment (46)       (25) (46)  
Intangible assets (233)       (180) (233)  
Accruals and other (2)       (547) (2)  
Total gross deferred tax liabilities $ (281)       $ (752) $ (281)