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Business Segments and Foreign Operations (Summarized Information Of Reportable Segments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Aug. 31, 2012
Segment Reporting Information [Line Items]          
Net sales $ 93,103 $ 87,022 $ 275,079 $ 257,933  
Income from operations 14,958 [1] 13,140 [1] 45,258 [2] 38,149 [2]  
Depreciation and amortization expense 1,327 1,216 3,765 3,691  
Interest income 105 61 362 182  
Interest expense 182 159 483 484  
Total assets 320,491 296,694 320,491 296,694 300,870
Operating Expenses 32,826 29,942 94,379 88,414  
Americas [Member]
          
Segment Reporting Information [Line Items]          
Net sales 47,677 43,972 133,249 130,622  
Income from operations 5,967 [1] 3,637 [1] 14,363 [2] 12,571 [2]  
Depreciation and amortization expense 1,033 887 2,905 2,567  
Interest income     1 1  
Interest expense 179 157 476 478  
Total assets 193,129 184,105 193,129 184,105  
Europe [Member]
          
Segment Reporting Information [Line Items]          
Net sales 32,462 30,100 100,107 88,227  
Income from operations 6,715 [1] 7,221 [1] 22,666 [2] 17,963 [2]  
Depreciation and amortization expense 240 281 717 989  
Interest income 74 33 252 90  
Total assets 109,278 96,195 109,278 96,195  
Asia-Pacific [Member]
          
Segment Reporting Information [Line Items]          
Net sales 12,964 12,950 41,723 39,084  
Income from operations 2,276 [1] 2,282 [1] 8,229 [2] 7,615 [2]  
Depreciation and amortization expense 54 48 143 135  
Interest income 31 28 109 91  
Interest expense 3 2 7 6  
Total assets 18,084 16,394 18,084 16,394  
Corporate [Member]
          
Segment Reporting Information [Line Items]          
Operating Expenses $ 4,900 $ 5,000 $ 14,700 $ 14,600  
[1] As of and for the Three Months Ended May 31:AmericasEuropeAsia-PacificTotal2013Net sales$ 47,677$ 32,462$ 12,964$ 93,103Income from operations (1)$ 5,967$ 6,715$ 2,276$ 14,958Depreciation and amortization expense$ 1,033$ 240$ 54$ 1,327Interest income$ -$ 74$ 31$ 105Interest expense$ 179$ -$ 3$ 182Total assets$ 193,129$ 109,278$ 18,084$ 320,4912012Net sales$ 43,972$ 30,100$ 12,950$ 87,022Income from operations (1)$ 3,637$ 7,221$ 2,282$ 13,140Depreciation and amortization expense$ 887$ 281$ 48$ 1,216Interest income$ -$ 33$ 28$ 61Interest expense$ 157$ -$ 2$ 159Total assets$ 184,105$ 96,195$ 16,394$ 296,694Income from operations for the Americas segment included corporate expenses of $4.9 million and $5.0 million for the three months ended May 31, 2013 and 2012, respectively.
[2] As of and for the Nine Months Ended May 31:AmericasEuropeAsia-PacificTotal2013Net sales$ 133,249$ 100,107$ 41,723$ 275,079Income from operations (2)$ 14,363$ 22,666$ 8,229$ 45,258Depreciation and amortization expense$ 2,905$ 717$ 143$ 3,765Interest income$ 1$ 252$ 109$ 362Interest expense$ 476$ -$ 7$ 483Total assets$ 193,129$ 109,278$ 18,084$ 320,4912012Net sales$ 130,622$ 88,227$ 39,084$ 257,933Income from operations (2)$ 12,571$ 17,963$ 7,615$ 38,149Depreciation and amortization expense$ 2,567$ 989$ 135$ 3,691Interest income$ 1$ 90$ 91$ 182Interest expense$ 478$ -$ 6$ 484Total assets$ 184,105$ 96,195$ 16,394$ 296,694Income from operations for the Americas segment included corporate expenses of $14.7 million and $14.6 million for the nine months ended May 31, 2013 and 2012, respectively.