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Schedule of Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Jun. 30, 2013
--- | --- | ---
Net Investment Income [Line Items] |  |
Amortized cost | $ 270,224 | $ 531,497
Gross unrealized holding gains | 383 | 154
Gross unrealized holding losses | (21) | (587)
Estimated fair value | 270,586 | 531,064
Cash |  |
Net Investment Income [Line Items] |  |
Amortized cost | 45,181 | 40,412
Estimated fair value | 45,181 | 40,412
Cash Equivalents |  |
Net Investment Income [Line Items] |  |
Amortized cost | 19,639 | 63,653
Gross unrealized holding gains | 1 | 8
Estimated fair value | 19,640 | 63,661
Total Cash And Cash Equivalents |  |
Net Investment Income [Line Items] |  |
Amortized cost | 64,820 | 104,065
Gross unrealized holding gains | 1 | 8
Estimated fair value | 64,821 | 104,073
Corporate Bonds And Notes |  |
Net Investment Income [Line Items] |  |
Amortized cost | 44,449 | 71,626
Gross unrealized holding gains | 36 | 13
Gross unrealized holding losses | (11) | (15)
Estimated fair value | 44,474 | 71,624
Municipal Bonds |  |
Net Investment Income [Line Items] |  |
Amortized cost | 137,821 | 251,513
Gross unrealized holding gains | 334 | 109
Gross unrealized holding losses | (3) | (537)
Estimated fair value | 138,152 | 251,085
Federal Agency Issues |  |
Net Investment Income [Line Items] |  |
Amortized cost | 23,134 | 104,293
Gross unrealized holding gains | 12 | 24
Gross unrealized holding losses | (7) | (35)
Estimated fair value | $ 23,139 | $ 104,282

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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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=28360136&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=27724398&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=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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