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Fair Value Measurements - Schedule of Fair Value of Financial Assets (Detail) - USD ($) $ in Millions		Dec. 31, 2015	Jun. 30, 2015
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		$ 171.5	$ 130.7
Money Market Funds
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	[1]	1.1	2.4
Corporate Bonds and Notes
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		59.6	44.8
Municipal Bonds
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		66.5	70.3
Federal Agency Issues
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		44.3	13.2
Level 1
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		1.1	2.4
Level 1 | Money Market Funds
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	[1]	1.1	2.4
Level 2
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		170.4	128.3
Level 2 | Corporate Bonds and Notes
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		59.6	44.8
Level 2 | Municipal Bonds
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		66.5	70.3
Level 2 | Federal Agency Issues
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		$ 44.3	$ 13.2
[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

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