Trade Accounts Receivable (Activity In Allowance For Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012
Trade Accounts Receivable [Abstract]
Beginning balance	$ 982	$ 851	$ 798
Charged to costs and expense	141	190	224
Deductions	(205)	(59)	(171)
Ending balance	$ 918	$ 982	$ 851