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Warranties (Schedule Of Product Warranty Liability) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Warranties [Abstract]    
Product warranty accrual balance, beginning of period $ 4,848 $ 3,651
Liabilities accrued for warranties during the period 1,292 899
Warranty claims paid during the period (1,088) (805)
Product warranty accrual balance, end of period $ 5,052 $ 3,745