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Fair Value Measurements - Schedule of Fair Value of Financial Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Jun. 30, 2014
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	$ 150,405us-gaap_AssetsFairValueDisclosure		$ 225,405us-gaap_AssetsFairValueDisclosure
Money Market Funds
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	2,699us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember	[1]	13,634us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember	[1]
Corporate Bonds And Notes
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	45,167us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember		44,474us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember
Municipal Bonds
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	83,608us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MunicipalBondsMember		144,158us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MunicipalBondsMember
Federal Agency Issues
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	18,931us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember		23,139us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember
Level 1
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	2,699us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member		13,634us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Money Market Funds
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	2,699us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	[1]	13,634us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	[1]
Level 2
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	147,706us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member		211,771us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Corporate Bonds And Notes
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	45,167us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member		44,474us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Municipal Bonds
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	83,608us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MunicipalBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member		144,158us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MunicipalBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Federal Agency Issues
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Total fair value of financial assets	$ 18,931us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member		$ 23,139us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
[1] Money market funds are primarily comprised of exchange traded funds and accrued interest

X

- 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

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