Contract Termination Costs (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Feb. 28, 2017	Feb. 28, 2017
Contract Termination Costs [Abstract]
Contract termination costs	$ 1,500	$ 1,500
License agreement period	10 years
Sub-licensee and minimum royalty payments	$ 16,300
Royalty ratio	33.00%
Royalty payments	$ 5,400
Profit sharing agreement, termination payment		$ 1,500

Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Name:	us-gaap_RoyaltyExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration