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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
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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

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- 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. + Details
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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 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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