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Schedule of Fair Value of Financial Assets (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Jun. 30, 2014
--- | --- | ---
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | $ 150,445 |  | $ 225,405 |
Money Market Funds |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 3,065 | [1] | 13,634 | [1]
Corporate Bonds And Notes |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 46,660 |  | 44,474 |
Municipal Bonds |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 85,634 |  | 144,158 |
Federal Agency Issues |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 15,086 |  | 23,139 |
Level 1 |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 3,065 |  | 13,634 |
Level 1 | Money Market Funds |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 3,065 | [1] | 13,634 | [1]
Level 2 |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 147,380 |  | 211,771 |
Level 2 | Corporate Bonds And Notes |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 46,660 |  | 44,474 |
Level 2 | Municipal Bonds |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 85,634 |  | 144,158 |
Level 2 | Federal Agency Issues |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | $ 15,086 |  | $ 23,139 |
[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=36462937&loc=d3e19207-110258 + Details
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