Segment Information (Schedule Of EBITDA Segment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 34,420	$ 31,402	$ 27,056
Share-based compensation expense	(3,534)	(3,589)	(3,835)
Reduction of contingent earnout	1,579
Impairment of related-party receivable	(363)
Depreciation	(3,383)	(3,008)	(3,142)
Amortization	(3,954)	(3,191)	(2,499)
Income from operations	24,765	21,614	17,580
Interest income	427	614	18
Interest expense	(2,237)	(2,332)	(2,482)
Discount on related-party receivables	(1,196)	(519)	(1,369)
Other income, net		21
Income before income taxes	21,759	19,398	13,747
Reportable Unit Assets [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	38,878	36,686	32,018
Depreciation	(2,042)	(1,613)	(1,801)
Amortization	(3,954)	(3,191)	(2,499)
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	(4,458)	(5,284)	(4,962)
Depreciation	$ (1,341)	$ (1,395)	$ (1,341)