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Business Segments and Foreign Operations - Summarized Information About Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Aug. 31, 2012
Segment Reporting Information [Line Items]      
Net sales $ 95,264 $ 84,945  
Income from operations 15,865 10,300  
Depreciation and amortization expense 1,203 1,218  
Interest income 62 52  
Interest expense 125 242  
Total assets 307,105 285,221 300,870
Americas [Member]
      
Segment Reporting Information [Line Items]      
Net sales 45,355 40,628  
Income from operations 4,571 2,413  
Depreciation and amortization expense 920 822  
Interest income 1 0  
Interest expense 123 240  
Total assets 184,483 179,537  
Europe [Member]
      
Segment Reporting Information [Line Items]      
Net sales 35,225 30,126  
Income from operations 8,451 4,809  
Depreciation and amortization expense 240 356  
Interest income 36 29  
Interest expense 0 0  
Total assets 104,861 91,831  
Asia-Pacific [Member]
      
Segment Reporting Information [Line Items]      
Net sales 14,684 14,191  
Income from operations 2,843 3,078  
Depreciation and amortization expense 43 40  
Interest income 25 23  
Interest expense 2 2  
Total assets $ 17,761 $ 13,853