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Auction Rate Securities - ARS Investments (Detail) - Auction Rate Securities Investments [Member] - USD ($)
$ in Millions
Mar. 31, 2017
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis   $ 12.5
Other-than- temporary Impairment in Retained Earnings   (7.2)
New Cost Basis   5.3
Unrealized Gain   3.3
Fair Value   8.6
Preferred Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis $ 5.0 5.0
Other-than- temporary Impairment in Retained Earnings (5.0) (5.0)
Unrealized Gain 1.5 1.5
Fair Value $ 1.5 1.5
Credit Linked Notes [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis   7.5
Other-than- temporary Impairment in Retained Earnings [1]   (2.2)
New Cost Basis   5.3
Unrealized Gain   1.8
Fair Value   $ 7.1
[1] Other-than-temporary impairment in retained earnings is partially offset by cumulative accretion of $4.4 million on non-current investments. Accretion is reclassified from accumulated other comprehensive income and recorded in the condensed consolidated statements of income as non-cash interest income.