Warranties (Schedule Of Product Warranty Liability) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014
Warranties [Abstract]
Product warranty accrual balance, beginning of period	$ 8,467	$ 8,417	$ 9,331	$ 6,695
Liabilities accrued for warranties during the period	1,374	2,100	2,772	5,834
Warranty claims paid during the period	(1,258)	(143)	(3,466)	(2,165)
Changes in estimates	(1,279)	(1,154)	(1,333)	(1,144)
Product warranty accrual balance, end of period	$ 7,304	$ 9,220	$ 7,304	$ 9,220