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Fair Value Measurements - Schedule of Fair Value of Financial Assets (Detail) - USD ($) $ in Millions | Jun. 30, 2015 | Jun. 30, 2014
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Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | $ 130.7 | $ 225.4
Money Market Funds |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets | [1] | 2.4 | 13.6
Corporate Bonds and Notes |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 44.8 | 44.5
Municipal Bonds |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 70.3 | 144.2
Federal Agency Issues |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 13.2 | 23.1
Level 1 |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 2.4 | 13.6
Level 1 | Money Market Funds |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets | [1] | 2.4 | 13.6
Level 2 |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 128.3 | 211.8
Level 2 | Corporate Bonds and Notes |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 44.8 | 44.5
Level 2 | Municipal Bonds |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 70.3 | 144.2
Level 2 | Federal Agency Issues |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | $ 13.2 | $ 23.1
[1] | Money market funds are primarily comprised of exchange traded funds and accrued interest

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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