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Fair Value Measurements - Schedule of Fair Value of Financial Assets (Detail) - USD ($) $ in Millions		Jun. 30, 2016	Jun. 30, 2015
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		$ 172.8	$ 130.7
Money Market Funds
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	[1]	2.4	2.4
Corporate Bonds and Notes
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		51.0	44.8
Municipal Bonds
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		85.6	70.3
Federal Agency Issues
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		25.5	13.2
US Government Securities
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		8.3
Level 1
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		2.4	2.4
Level 1 | Money Market Funds
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	[1]	2.4	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		51.0	44.8
Level 2 | Municipal Bonds
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		85.6	70.3
Level 2 | Federal Agency Issues
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		25.5	$ 13.2
Level 2 | US Government Securities
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets		$ 8.3
[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=66048111&loc=d3e19207-110258

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