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Marketable Investment Securities - Additional Information (Detail) - USD ($)	Jun. 30, 2020	Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]
Gross unrealized loss position debt securities classified as available for sale	$ 0	$ 0

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563

+ Details

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Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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