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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	Mar. 31, 2014	Jun. 30, 2013
Net Investment Income [Line Items]
Amortized cost	$ 277,378	$ 531,497
Gross unrealized holding gains	346	154
Gross unrealized holding losses	(11)	(587)
Estimated fair value	277,713	531,064
Cash
Net Investment Income [Line Items]
Amortized cost	82,536	40,412
Estimated fair value	82,536	40,412
Cash Equivalents
Net Investment Income [Line Items]
Amortized cost	3,262	63,653
Gross unrealized holding gains		8
Estimated fair value	3,262	63,661
Total Cash And Cash Equivalents
Net Investment Income [Line Items]
Amortized cost	85,798	104,065
Gross unrealized holding gains		8
Estimated fair value	85,798	104,073
Corporate Bonds And Notes
Net Investment Income [Line Items]
Amortized cost	49,396	71,626
Gross unrealized holding gains	43	13
Gross unrealized holding losses	(3)	(15)
Estimated fair value	49,436	71,624
Municipal Bonds
Net Investment Income [Line Items]
Amortized cost	123,997	251,513
Gross unrealized holding gains	286	109
Gross unrealized holding losses	(8)	(537)
Estimated fair value	124,275	251,085
Federal Agency Issues
Net Investment Income [Line Items]
Amortized cost	18,187	104,293
Gross unrealized holding gains	17	24
Gross unrealized holding losses		(35)
Estimated fair value	18,204	104,282
Total Available For Sale
Net Investment Income [Line Items]
Amortized cost	191,580	427,432
Gross unrealized holding gains	346	146
Gross unrealized holding losses	(11)	(587)
Estimated fair value	$ 191,915	$ 426,991

X

- Definition

Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

+ References

No definition available.

+ Details

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X

- Definition

Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

+ References

No definition available.

+ Details

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X

- 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

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X

- 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

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