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Marketable Investment Securities - Schedule of Debt Securities Available-For-Sale in Gross Unrealized Loss Position (Detail) - USD ($) $ in Millions | Jun. 30, 2015 | Jun. 30, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | $ 51.1 | $ 29.6
Unrealized losses, Less than 12 months | (0.1) | 0.0
Fair Value, More than 12 months | 0.0 | 0.0
Unrealized losses, More than 12 months | 0.0 | 0.0
Fair value, Total | 51.1 | 29.6
Unrealized losses, Total | (0.1) | 0.0
Corporate Bonds and Notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | 24.4 | 16.0
Unrealized losses, Less than 12 months | 0.0 | 0.0
Fair Value, More than 12 months | 0.0 | 0.0
Unrealized losses, More than 12 months | 0.0 | 0.0
Fair value, Total | 24.4 | 16.0
Unrealized losses, Total | 0.0 | 0.0
Municipal Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | 24.8 | 8.6
Unrealized losses, Less than 12 months | (0.1) | 0.0
Fair Value, More than 12 months | 0.0 | 0.0
Unrealized losses, More than 12 months | 0.0 | 0.0
Fair value, Total | 24.8 | 8.6
Unrealized losses, Total | (0.1) | 0.0
Federal Agency Issues |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | 1.9 | 5.0
Unrealized losses, Less than 12 months | 0.0 | 0.0
Fair Value, More than 12 months | 0.0 | 0.0
Unrealized losses, More than 12 months | 0.0 | 0.0
Fair value, Total | 1.9 | 5.0
Unrealized losses, Total | $ 0.0 | $ 0.0

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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