Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Dec. 08, 2015	Mar. 27, 2015	Jan. 23, 2015	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016	Dec. 14, 2015	Aug. 31, 2015
Class of Stock [Line Items]
Shares of preferred stock authorized for issuance				14,000,000	14,000,000
Preferred stock issued				0	0
Preferred stock outstanding				0	0
Amount authorized under common stock repurchase plan		$ 40,000
Number of shares withheld for minimum statutory taxes				104,699	51,156	2,260
Values of withheld shares				$ 2,000	$ 900	$ 38
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
Stock repurchased during period, shares			10,000,000	1,539,828
Stock repurchased during period, value				$ 26,800
Cash and cash equivalents		10,000		$ 10,153	$ 8,924	$ 10,456		$ 16,234
Minimum [Member]
Class of Stock [Line Items]
Dutch auction tender offer share price of common stock	$ 15.50
Available cash for debt financing		$ 10,000
Maximum [Member]
Class of Stock [Line Items]
Dutch auction tender offer share price of common stock	$ 17.75