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Schedule of Fair Value of Financial Assets (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Jun. 30, 2013
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Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | $ 195,177 |  | $ 490,652 |
Money Market Funds |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 3,262 | [1] | 12,691 | [1]
Corporate Bonds And Notes |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 49,436 |  | 71,624 |
Municipal Bonds |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 124,275 |  | 302,055 |
Federal Agency Issues |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 18,204 |  | 104,282 |
Level 1 |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 3,262 |  | 12,691 |
Level 1 | Money Market Funds |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 3,262 | [1] | 12,691 | [1]
Level 2 |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 191,915 |  | 477,961 |
Level 2 | Corporate Bonds And Notes |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 49,436 |  | 71,624 |
Level 2 | Municipal Bonds |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 124,275 |  | 302,055 |
Level 2 | Federal Agency Issues |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | $ 18,204 |  | $ 104,282 |
[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=25499696&loc=d3e19207-110258 + Details
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