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Warranties (Schedule Of Product Warranty Liability) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Warranties [Abstract]    
Product warranty accrual balance, beginning of period $ 9,331us-gaap_ProductWarrantyAccrual $ 6,695us-gaap_ProductWarrantyAccrual
Liabilities accrued for warranties during the period 983us-gaap_ProductWarrantyAccrualWarrantiesIssued 3,042us-gaap_ProductWarrantyAccrualWarrantiesIssued
Warranty claims paid during the period (1,140)us-gaap_ProductWarrantyAccrualPayments (1,115)us-gaap_ProductWarrantyAccrualPayments
Product warranty accrual balance, end of period $ 9,174us-gaap_ProductWarrantyAccrual $ 8,622us-gaap_ProductWarrantyAccrual