Earnings Per Share (Antidilutive Securities Excluded from EPS Computation) (Details) - shares	3 Months Ended	9 Months Ended
May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options excluded from diluted earnings per share (in shares)	239,230	149,000	179,385	113,074
Restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options excluded from diluted earnings per share (in shares)	240,783	176,249	257,617	87,219

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration