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Business Segments and Foreign Operations - Summarized Information about Reportable Segments (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
Aug. 31, 2012
Segment Reporting Information [Line Items]          
Net sales $ 86,712 $ 85,966 $ 181,976 $ 170,911  
Income from operations 14,435 14,709 30,300 25,009  
Depreciation and amortization expense 1,235 1,257 2,438 2,475  
Interest income 195 69 257 121  
Interest expense 176 83 301 325  
Total assets 311,960 298,994 311,960 298,994 300,870
Americas [Member]
          
Segment Reporting Information [Line Items]          
Net sales 40,217 46,023 85,572 86,651  
Income from operations 3,825 6,521 8,396 8,934  
Depreciation and amortization expense 952 858 1,872 1,680  
Interest income 0 1 1 1  
Interest expense 174 81 297 321  
Total assets 188,571 186,778 188,571 186,778  
Europe [Member]
          
Segment Reporting Information [Line Items]          
Net sales 32,420 28,001 67,645 58,127  
Income from operations 7,500 5,933 15,951 10,742  
Depreciation and amortization expense 237 352 477 708  
Interest income 142 28 178 57  
Interest expense 0 0 0 0  
Total assets 106,292 95,993 106,292 95,993  
Asia-Pacific [Member]
          
Segment Reporting Information [Line Items]          
Net sales 14,075 11,942 28,759 26,133  
Income from operations 3,110 2,255 5,953 5,333  
Depreciation and amortization expense 46 47 89 87  
Interest income 53 40 78 63  
Interest expense 2 2 4 4  
Total assets $ 17,097 $ 16,223 $ 17,097 $ 16,223