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Business Segments and Foreign Operations (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Summarized information about reportable segments      
Net sales $ 342,784 $ 336,409 $ 321,516
Income from operations 51,729 54,132 55,198
Depreciation and amortization expense 4,869 4,386 4,248
Interest income 261 228 174
Interest expense 729 1,076 1,726
Total assets 300,870 279,777 289,108
Americas [Member]
      
Summarized information about reportable segments      
Net sales 177,394 169,881 179,867
Income from operations 19,747 19,777 25,095
Depreciation and amortization expense 3,468 2,822 2,856
Interest income 1 8 0
Interest expense 721 1,066 1,717
Total assets 188,194 171,813 195,991
Europe [Member]
      
Summarized information about reportable segments      
Net sales 116,936 125,400 110,367
Income from operations 23,524 27,846 25,075
Depreciation and amortization expense 1,224 1,377 1,236
Interest income 122 108 108
Interest expense 0 0 0
Total assets 99,091 96,332 83,683
Asia-Pacific [Member]
      
Summarized information about reportable segments      
Net sales 48,454 41,128 31,282
Income from operations 8,458 6,509 5,028
Depreciation and amortization expense 177 187 156
Interest income 138 112 66
Interest expense 8 10 9
Total assets $ 13,585 $ 11,632 $ 9,434