Stockholders' Equity - Stock Repurchases, Cash Dividend (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	9 Months Ended
May 31, 2020	May 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Cash Dividends
Cash dividends declared (in dollars per share)	$ 0.00	$ 0.00
Cash dividend paid			$ 2,538	$ 2,279

Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration