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Warranties (Schedule Of Product Warranty Liability) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Warranties [Abstract]        
Product warranty accrual balance, beginning of period $ 5,572 $ 3,829 $ 4,848 $ 3,651
Liabilities accrued for warranties during the period 2,240 1,250 4,766 2,985
Warranty claims paid during the period (1,330) (946) (3,132) (2,503)
Product warranty accrual balance, end of period $ 6,482 $ 4,133 $ 6,482 $ 4,133