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Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amounts of Definite-Lived Intangible Assets by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Finite-Lived Intangible Assets [Line Items]        
Beginning balance     $ 27,685  
Amortization expense (465) (580) (931) (1,165)
Translation adjustments     (126)  
Ending balance 26,628   26,628  
Americas [Member]
       
Finite-Lived Intangible Assets [Line Items]        
Beginning balance     24,714  
Amortization expense     (850)  
Translation adjustments     0  
Ending balance 23,864   23,864  
Europe [Member]
       
Finite-Lived Intangible Assets [Line Items]        
Beginning balance     2,971  
Amortization expense     (81)  
Translation adjustments     (126)  
Ending balance 2,764   2,764  
Asia-Pacific [Member]
       
Finite-Lived Intangible Assets [Line Items]        
Beginning balance     0  
Amortization expense     0  
Translation adjustments     0  
Ending balance $ 0   $ 0