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Warranties (Schedule Of Product Warranty Liability) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Warranties [Abstract]        
Product warranty accrual balance, beginning of period $ 8,622 $ 5,052 $ 6,695 $ 4,848
Liabilities accrued for warranties during the period 703 1,234 3,745 2,526
Warranty claims paid during the period (908) (714) (2,023) (1,802)
Product warranty accrual balance, end of period $ 8,417 $ 5,572 $ 8,417 $ 5,572