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Business Segments and Foreign Operations (Summarized Information By Reportable Segments) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 28, 2019
USD ($)
Feb. 28, 2018
USD ($)
Feb. 28, 2019
USD ($)
item
Feb. 28, 2018
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | item     3  
Net sales $ 101,335 $ 101,256 $ 202,617 $ 198,853
Income from operations 19,715 19,368 36,116 36,504
Depreciation and amortization expense 1,900 1,969 3,825 3,886
Interest income 45 131 96 264
Interest expense 685 1,002 1,395 1,843
Unallocated Corporate [Member]        
Segment Reporting Information [Line Items]        
Income from operations [1] (6,050) (6,681) (13,067) (13,031)
Depreciation and amortization expense [1] 53 196 105 388
Americas Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales 43,897 44,967 91,688 91,130
Income from operations 9,992 10,336 21,294 21,366
Depreciation and amortization expense 1,132 1,046 2,263 2,140
Interest income 10   16 1
Interest expense 620 999 1,328 1,838
EMEA Segments [Member]        
Segment Reporting Information [Line Items]        
Net sales 40,966 39,632 79,711 74,660
Income from operations 10,630 10,532 19,005 18,368
Depreciation and amortization expense 644 646 1,316 1,205
Interest income 2 118 20 237
Interest expense 63   63  
Asia-Pacific Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales 16,472 16,657 31,218 33,063
Income from operations 5,143 5,181 8,884 9,801
Depreciation and amortization expense 71 81 141 153
Interest income 33 13 60 26
Interest expense $ 2 $ 3 $ 4 $ 5
[1] Unallocated corporate expenses are general corporate overhead expenses not directly attributable to any one of the business 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.