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Marketable Investment Securities - Schedule of Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 68.5	$ 64.1	$ 64.8	$ 104.1
Gross unrealized holding gains	0.5	0.1
Gross unrealized holding losses		(0.1)
Amortized cost	238.4	185.4
Estimated fair value	238.9	185.4
Corporate Bonds and Notes
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	50.8	41.8
Gross unrealized holding gains	0.2
Estimated fair value	51.0	41.8
Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	85.4	66.3
Gross unrealized holding gains	0.2	0.1
Gross unrealized holding losses		(0.1)
Estimated fair value	85.6	66.3
Federal Agency Issues
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	25.5	13.2
Estimated fair value	25.5	13.2
Cash
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	66.1	54.7
Estimated fair value	66.1	54.7
Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	2.4	9.4
Estimated fair value	2.4	9.4
Total Cash and Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	68.5	64.1
Estimated fair value	68.5	$ 64.1
US Government Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	8.2
Gross unrealized holding gains	0.1
Estimated fair value	$ 8.3

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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