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Fair Value Measurements - Schedule of Financial Assets Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2013
Aug. 31, 2012
Assets:    
Total assets $ 47,410 $ 5,058
Money market funds [Member]
    
Assets:    
Total assets 865 4,025
Time deposits [Member]
    
Assets:    
Total assets 16,733  
Term deposits [Member]
    
Assets:    
Total assets 1,021 1,033
Callable time deposits [Member]
    
Assets:    
Total assets 28,791  
Level 1 [Member]
    
Assets:    
Total assets 0 0
Level 1 [Member] | Money market funds [Member]
    
Assets:    
Total assets 0 0
Level 1 [Member] | Time deposits [Member]
    
Assets:    
Total assets 0  
Level 1 [Member] | Term deposits [Member]
    
Assets:    
Total assets 0 0
Level 1 [Member] | Callable time deposits [Member]
    
Assets:    
Total assets 0  
Level 2 [Member]
    
Assets:    
Total assets 47,410 5,058
Level 2 [Member] | Money market funds [Member]
    
Assets:    
Total assets 865 4,025
Level 2 [Member] | Time deposits [Member]
    
Assets:    
Total assets 16,733  
Level 2 [Member] | Term deposits [Member]
    
Assets:    
Total assets 1,021 1,033
Level 2 [Member] | Callable time deposits [Member]
    
Assets:    
Total assets 28,791  
Level 3 [Member]
    
Assets:    
Total assets 0 0
Level 3 [Member] | Money market funds [Member]
    
Assets:    
Total assets 0 0
Level 3 [Member] | Time deposits [Member]
    
Assets:    
Total assets 0  
Level 3 [Member] | Term deposits [Member]
    
Assets:    
Total assets 0 0
Level 3 [Member] | Callable time deposits [Member]
    
Assets:    
Total assets $ 0