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Business Segments and Foreign Operations (Summarized Information By Reportable Segments) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2017
USD ($)
May 31, 2016
USD ($)
May 31, 2017
USD ($)
item
May 31, 2016
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | item     3  
Net sales $ 98,178 $ 96,446 $ 283,945 $ 283,518
Income from operations 20,613 18,668 55,991 53,719
Depreciation and amortization expense 1,707 1,582 5,005 4,893
Interest income 112 186 392 517
Interest expense 693 433 1,822 1,222
Unallocated Corporate [Member]        
Segment Reporting Information [Line Items]        
Income from operations [1] (5,957) (5,686) (19,114) (17,329)
Depreciation and amortization expense [1] 10 8 28 23
Americas [Member]        
Segment Reporting Information [Line Items]        
Net sales 49,046 49,878 136,964 139,832
Income from operations 14,402 13,329 35,861 35,003
Depreciation and amortization expense 1,100 960 3,239 3,101
Interest income 2 1 6 4
Interest expense 691 429 1,813 1,212
EMEA [Member]        
Segment Reporting Information [Line Items]        
Net sales 34,386 32,922 100,848 100,634
Income from operations 8,009 7,150 25,514 23,278
Depreciation and amortization expense 534 543 1,552 1,567
Interest income 97 118 286 366
Asia-Pacific [Member]        
Segment Reporting Information [Line Items]        
Net sales 14,746 13,646 46,133 43,052
Income from operations 4,159 3,875 13,730 12,767
Depreciation and amortization expense 63 71 186 202
Interest income 13 67 100 147
Interest expense $ 2 $ 4 $ 9 $ 10
[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 condensed consolidated statements of operations.