Commitments And Contingencies (Narrative) (Details)	Nov. 30, 2019 USD ($)
Purchase Commitment [Member]
Loss Contingencies [Line Items]
Commitment outstanding	$ 0
Indemnification Agreement 2 [Member]
Loss Contingencies [Line Items]
Liabilities related to indemnification agreement	0
Senior Officers And Directors [Member] \| Indemnification Agreement 1 [Member]
Loss Contingencies [Line Items]
Liabilities related to indemnification agreement	$ 0

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248

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