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Condensed Consolidated Statements Of Earnings - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Income Statement [Abstract]    
Operating revenues $ 111,951 $ 124,526
Cost of operating revenues 83,303 92,129
Gross profit 28,648 32,397
Operating expenses:    
Selling expense 7,982 10,225
General and administrative expense 15,058 11,918
Engineering and research expense 3,568 4,053
Total operating expenses 26,608 26,196
Operating income 2,040 6,201
Other income (expense):    
Interest expense (1,205) (1,181)
Interest income 654 320
Other (expense) income, net 192 (548)
Earnings before income taxes 1,681 4,792
Income tax expense 469 1,607
Net earnings $ 1,212 $ 3,185
Earnings per share:    
Basic $ 0.11 $ 0.30
Diluted $ 0.11 $ 0.30
Shares used in computing earnings per share:    
Basic 10,766 10,705
Diluted 10,806 10,740
Cash dividends declared per share $ 0.31 $ 0.30