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Fair Value Measurements - Schedule of Fair Value of Financial Assets (Detail) - USD ($) $ in Millions		Jun. 30, 2015	Jun. 30, 2014
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

X

- 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

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- Definition

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+ References

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