Segment Information (Schedule Of EBITDA Segment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 31,402	$ 27,056	$ 21,157
Share-based compensation	(3,589)	(3,835)	(2,788)
Severance costs			(150)
Depreciation	(3,008)	(3,142)	(3,567)
Amortization	(3,191)	(2,499)	(3,540)
Income from operations	21,614	17,580	11,112
Interest income	614	18	21
Interest expense	(2,332)	(2,482)	(2,687)
Discount on related-party receivables	(519)	(1,369)
Other, net	21
Income from continuing operations before income taxes	19,398	13,747	8,446
Reportable Unit Assets [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	36,686	32,018	28,015
Depreciation	(1,613)	(1,801)	(2,158)
Amortization	(3,191)	(2,499)	(3,540)
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	(5,284)	(4,962)	(6,858)
Depreciation	$ (1,395)	$ (1,341)	$ (1,409)