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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, 2019
USD ($)
May 31, 2018
USD ($)
May 31, 2019
USD ($)
item
May 31, 2018
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | item     3  
Net sales $ 113,989 $ 107,025 $ 316,606 $ 305,878
Income from operations 23,202 22,329 59,318 58,833
Depreciation and amortization expense 1,885 1,963 5,710 5,849
Interest income 27 107 123 371
Interest expense 567 1,205 1,962 3,048
Unallocated Corporate [Member]        
Segment Reporting Information [Line Items]        
Income from operations [1] (6,486) (6,243) (19,553) (19,274)
Depreciation and amortization expense [1] 63 198 168 586
Americas Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales 52,966 52,999 144,654 144,129
Income from operations 15,418 15,709 36,712 37,075
Depreciation and amortization expense 1,137 999 3,400 3,139
Interest income 6   22 1
Interest expense 399 1,202 1,727 3,040
EMEA Segments [Member]        
Segment Reporting Information [Line Items]        
Net sales 44,548 39,571 124,259 114,231
Income from operations 9,918 9,565 28,923 27,933
Depreciation and amortization expense 614 685 1,930 1,890
Interest income 1 34 21 271
Interest expense 167   230  
Asia-Pacific Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales 16,475 14,455 47,693 47,518
Income from operations 4,352 3,298 13,236 13,099
Depreciation and amortization expense 71 81 212 234
Interest income 20 73 80 99
Interest expense $ 1 $ 3 $ 5 $ 8
[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.