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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, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Warranties [Abstract]        
Product warranty accrual balance, beginning of period $ 3,829 $ 1,916 $ 3,651 $ 1,862
Liabilities accrued for warranties during the period 1,250 1,380 2,985 3,065
Warranty claims paid during the period (946) (717) (2,503) (2,348)
Product warranty accrual balance, end of period $ 4,133 $ 2,579 $ 4,133 $ 2,579