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Business Segments and Foreign Operations (Summarized Information By Reportable Segments) (Details)
$ in Thousands
 12 Months Ended
Aug. 31, 2018
USD ($)
item
Aug. 31, 2017
USD ($)
Aug. 31, 2016
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | item 3    
Net sales $ 408,518 $ 380,506 $ 380,670
Income from operations 78,604 75,909 71,348
Depreciation and amortization expense 7,800 6,769 6,465
Interest income 454 508 683
Interest expense 4,219 2,582 1,703
Unallocated Corporate [Member]      
Segment Reporting Information [Line Items]      
Income from operations [1] (25,689) (24,548) (23,920)
Depreciation and amortization expense [1] 784 155 30
Americas Segment [Member]      
Segment Reporting Information [Line Items]      
Net sales 192,878 184,929 191,397
Income from operations 48,954 48,303 48,404
Depreciation and amortization expense 4,142 4,270 4,071
Interest income 13 8 5
Interest expense 4,209 2,570 1,689
EMEA Segments [Member]      
Segment Reporting Information [Line Items]      
Net sales 150,878 136,771 135,235
Income from operations 36,241 35,389 31,702
Depreciation and amortization expense 2,561 2,090 2,084
Interest income 320 389 485
Asia-Pacific Segment [Member]      
Segment Reporting Information [Line Items]      
Net sales 64,762 58,806 54,038
Income from operations 19,098 16,765 15,162
Depreciation and amortization expense 313 254 280
Interest income 121 111 193
Interest expense $ 10 $ 12 $ 14
[1] Unallocated corporate expenses are general corporate overhead expenses not directly attributable to any one of the operating segments. These expenses are reported separate from the Company's identified segments and are included in Selling, General and Administrative expenses on the Company's consolidated statements of operations.