Purchases Of Common Shares (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	9 Months Ended
	Dec. 08, 2015	Mar. 27, 2015	May 28, 2016	May 28, 2016	Dec. 14, 2015	Aug. 31, 2015	May 30, 2015	Jan. 23, 2015	Aug. 31, 2014
Equity [Line Items]
Amount authorized under common stock repurchase plan		$ 40,000						$ 10,000
Cash and cash equivalents		10,000	$ 8,863	$ 8,863		$ 16,234	$ 13,795		$ 10,483
Available cash for debt financing for repurchase common stock		$ 10,000
Stock repurchased during period, shares			135,724	895,638
Stock repurchased during period, value			$ 2,100	$ 16,200
Dutch auction tender offer amount for shares of common stock	$ 35,000
Dutch auction tender offer commence date	Dec. 14, 2015
Dutch auction tender offer expiration date	Jan. 12, 2016
Common stock shares acquired from fully subscribed Dutch auction tender offer					1,971,832
Price per share, common stock share acquired from fully subscribed Dutch auction tender offer					$ 17.75
Total tender offer cost					$ 35,300
Minimum [Member]
Equity [Line Items]
Dutch auction tender offer share price of common stock	$ 15.50
Maximum [Member]
Equity [Line Items]
Dutch auction tender offer share price of common stock	$ 17.75