Business Acquisitions (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Jul. 11, 2017	May 15, 2017	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017	Dec. 31, 2016	Aug. 31, 2016
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration			$ 6,965	$ 4,548	$ 6,965
Payment of contingent consideration				3,431
Revenues				209,758	185,256		$ 200,055
Income (loss) from operations				(3,366)	(8,880)		13,849
Selling, general, and administrative				141,126	121,148		$ 113,589
Robert Gregory Partners [Member]
Business Acquisition, Contingent Consideration [Line Items]
Purchase price in cash		$ 3,500
Contingent consideration		$ 4,500	913	606	913
Payment of contingent consideration				1,000
Revenues					1,200	$ 3,300
Income (loss) from operations					400	1,100
Selling, general, and administrative						100
Robert Gregory Partners [Member] | Add On Coaching Services [Member]
Business Acquisition, Contingent Consideration [Line Items]
Payment of contingent consideration			500	1,000
Jhana Education [Member]
Business Acquisition, Contingent Consideration [Line Items]
Purchase price in cash	$ 3,525
Contingent consideration	$ 7,200		$ 6,052	3,942	$ 6,052
Payment of contingent consideration				2,431
Revenues						1,600
Income (loss) from operations						(3,100)
Selling, general, and administrative						$ 100
Jhana Education [Member] | Paid Within 90 Days Of Acquisition Date [Member]
Business Acquisition, Contingent Consideration [Line Items]
Payment of contingent consideration				$ 1,100