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Business Segments and Foreign Operations (Summarized Information By Reportable Segments) (Details) $ in Thousands | 12 Months Ended
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Aug. 31, 2017 USD ($) item | Aug. 31, 2016 USD ($) | Aug. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | item |  | 3 |  |
Net sales |  | $ 380,506 | $ 380,670 | $ 378,150
Income from operations |  | 75,909 | 71,348 | 65,390
Depreciation and amortization expense |  | 6,769 | 6,465 | 6,464
Interest income |  | 508 | 683 | 584
Interest expense |  | 2,582 | 1,703 | 1,205
Unallocated Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from operations | [1] | (24,548) | (23,920) | (24,059)
Depreciation and amortization expense | [1] | 155 | 30 | 31
Americas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 184,929 | 191,397 | 187,344
Income from operations |  | 48,303 | 48,404 | 46,674
Depreciation and amortization expense |  | 4,270 | 4,071 | 4,078
Interest income |  | 8 | 5 | 9
Interest expense |  | 2,570 | 1,689 | 1,197
EMEA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 136,771 | 135,235 | 136,847
Income from operations |  | 35,389 | 31,702 | 30,173
Depreciation and amortization expense |  | 2,090 | 2,084 | 2,102
Interest income |  | 389 | 485 | 417
Asia-Pacific [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 58,806 | 54,038 | 53,959
Income from operations |  | 16,765 | 15,162 | 12,602
Depreciation and amortization expense |  | 254 | 280 | 253
Interest income |  | 111 | 193 | 158
Interest expense |  | $ 12 | $ 14 | $ 8
[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.

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