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Auction Rate Securities - ARS Investments (Detail) - Auction Rate Securities Investments [Member] - USD ($) $ in Millions | Sep. 30, 2016 | Jun. 30, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Original Cost Basis | $ 12.5 |  | $ 12.5 |
Other-than- temporary Impairment in Retained Earnings | (6.9) |  | (7.2) |
New Cost Basis | 5.6 |  | 5.3 |
Unrealized Gain | 3.0 |  | 3.3 |
Fair Value | 8.6 |  | 8.6 |
Credit Linked Notes [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Original Cost Basis | 7.5 |  | 7.5 |
Other-than- temporary Impairment in Retained Earnings | (1.9) | [1] | (2.2) | [2]
New Cost Basis | 5.6 |  | 5.3 |
Unrealized Gain | 1.5 |  | 1.8 |
Fair Value | 7.1 |  | 7.1 |
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 |
[1] | Other-than-temporary impairment in retained earnings is partially offset by cumulative accretion of $4.7 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.
[2] | 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.

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