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Marketable Investment Securities - Schedule of Debt Securities Available-For-Sale in Gross Unrealized Loss Position (Detail) - USD ($)	Jun. 30, 2019	Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 2,500,000	$ 69,500,000
Unrealized losses, Less than 12 months		400,000
Fair Value, More than 12 months	22,500,000	21,800,000
Unrealized losses, More than 12 months	0	200,000
Fair value, Total	25,000,000.0	91,300,000
Unrealized losses, Total	0	600,000
Corporate Bonds and Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	2,500,000	35,600,000
Unrealized losses, Less than 12 months		200,000
Fair Value, More than 12 months	12,500,000	9,800,000
Unrealized losses, More than 12 months	0	100,000
Fair value, Total	15,000,000.0	45,400,000
Unrealized losses, Total		300,000
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months		24,600,000
Unrealized losses, Less than 12 months		100,000
Fair Value, More than 12 months	5,000,000.0	500,000
Unrealized losses, More than 12 months	0	0
Fair value, Total	5,000,000.0	25,100,000
Unrealized losses, Total		0
Federal Agency Issues [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months		3,000,000.0
Unrealized losses, Less than 12 months		100,000
Fair Value, More than 12 months	5,000,000.0	9,500,000
Unrealized losses, More than 12 months	0	100,000
Fair value, Total	5,000,000.0	12,500,000
Unrealized losses, Total		200,000
US Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months		6,300,000
Fair Value, More than 12 months		2,000,000.0
Unrealized losses, More than 12 months	$ 0	0
Fair value, Total		$ 8,300,000

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

No definition available.

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- 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=82897076&loc=d3e27337-111563

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