Income Taxes Unrecognized Tax Benefits (Narrative) (Details) $ in Millions	Aug. 31, 2019 USD ($)
Unrecognized Tax Benefits Narrative [Abstract]
Income Tax Examination, Penalties and Interest Accrued	$ 1.0
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 1.4

The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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