Other Long Term Investments - Narrative (Details) $ in Millions	3 Months Ended
Dec. 31, 2020 USD ($) shares
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments \| $	$ 2.5
Cardinal Ventures Holdings \| Common Class A
Schedule of Equity Method Investments [Line Items]
Number of common shares sold under offering (in shares)	600,000
Cardinal Ventures Holdings \| Common Class B
Schedule of Equity Method Investments [Line Items]
Number of common shares sold under offering (in shares)	2,500,000

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration