Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
Feb. 28, 2018	Aug. 31, 2017
Contingent consideration	$ 6,465	$ 6,965
Robert Gregory Partners, LLC [Member]
Contingent consideration	1,337	913
Robert Gregory Partners, LLC [Member] \| Accrued Liabilities [Member]
Contingent consideration	1,000
Jhana Education [Member]
Contingent consideration	5,128	$ 6,052
Contingent liability payment classified as investing activities	1,100
Jhana Education [Member] \| Accrued Liabilities [Member]
Contingent consideration	$ 1,900

Amount of liability recognized arising from contingent consideration in a business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

Name:	us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant