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Warranties (Schedule Of Product Warranty Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2017
May 31, 2016
May 31, 2017
May 31, 2016
Warranties [Abstract]        
Product warranty accrual balance, beginning of period $ 6,938 $ 6,431 $ 7,443 $ 7,271
Liabilities accrued for warranties during the period 2,364 1,372 4,225 3,676
Warranty claims paid during the period (1,893) (1,267) (4,514) (3,853)
Changes in estimates 186 (78) 441 (636)
Product warranty accrual balance, end of period $ 7,595 $ 6,458 $ 7,595 $ 6,458