Supplemental Financial Statement Information - AFS Securities (Details) - USD ($) $ in Thousands	9 Months Ended
Aug. 31, 2019	Nov. 30, 2018
Investments - Held-to-maturity Securities
Repurchase agreements	$ 9,011	$ 17,000
Repurchase agreements weighted average maturity	55 days

Amount of investment in debt security measured at amortized cost (held-to-maturity), classified as current.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26626-111562

Name:	us-gaap_HeldToMaturitySecuritiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant