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Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Accumulated Other Comprehensive Loss [Abstract]      
Defined benefit pension plan, net of tax benefit of $885 and $1,362 $ (2,916) $ (2,199)  
Foreign currency translation, net of hedging activities, net of tax expense of $3,202 and $2,686 (16,931) (15,889)  
Total accumulated other comprehensive loss $ (19,847) $ (18,088) $ (12,108)