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Auction Rate Securities - ARS Investments (Detail) - Auction Rate Securities Investments [Member] - USD ($) $ in Millions | Mar. 31, 2017 | Jun. 30, 2016
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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.

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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