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Warranties (Schedule Of Product Warranty Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Product Warranties Disclosures [Abstract]        
Product warranty accrual balance, beginning of period $ 8,187 $ 7,572 $ 8,411 $ 7,443
Liabilities accrued for warranties during the period 647 860 2,103 1,861
Warranty claims paid during the period (1,245) (1,420) (2,933) (2,621)
Changes in estimates (41) (74) (33) 255
Product warranty accrual balance, end of period $ 7,548 $ 6,938 $ 7,548 $ 6,938