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Schedule of Fair Value of Financial Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Jun. 30, 2013
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets $ 225,405 $ 490,652
Money Market Funds
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 13,634 [1] 12,691 [1]
Corporate Bonds And Notes
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 44,474 71,624
Municipal Bonds
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 144,158 302,055
Federal Agency Issues
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 23,139 104,282
Level 1
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 13,634 12,691
Level 1 | Money Market Funds
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 13,634 [1] 12,691 [1]
Level 2
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 211,771 477,961
Level 2 | Corporate Bonds And Notes
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 44,474 71,624
Level 2 | Municipal Bonds
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 144,158 302,055
Level 2 | Federal Agency Issues
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets $ 23,139 $ 104,282
[1] Money market funds are primarily comprised of exchange traded funds and accrued interest