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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	Sep. 30, 2014	Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 236,127	$ 270,224
Gross unrealized holding gains	254	383
Gross unrealized holding losses	(24)	(21)
Estimated fair value	236,357	270,586
Cash
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	63,238	45,181
Estimated fair value	63,238	45,181
Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	6,565	19,639
Gross unrealized holding gains		1
Estimated fair value	6,565	19,640
Restricted Cash
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	22,674
Estimated fair value	22,674
Total Cash, Cash Equivalents and Restricted Cash
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	92,477
Estimated fair value	92,477
Total Cash And Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized cost		64,820
Gross unrealized holding gains		1
Estimated fair value		64,821
Corporate Bonds And Notes
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	43,157	44,449
Gross unrealized holding gains	21	36
Gross unrealized holding losses	(18)	(11)
Estimated fair value	43,160	44,474
Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	85,412	137,821
Gross unrealized holding gains	225	334
Gross unrealized holding losses	(3)	(3)
Estimated fair value	85,634	138,152
Federal Agency Issues
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	15,081	23,134
Gross unrealized holding gains	8	12
Gross unrealized holding losses	(3)	(7)
Estimated fair value	15,086	23,139
Total Available For Sale
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	143,650	205,404
Gross unrealized holding gains	254	382
Gross unrealized holding losses	(24)	(21)
Estimated fair value	$ 143,880	$ 205,765

X

- 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)

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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

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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