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Schedule of Maturities of Debt Securities Classified as Cash Equivalents and Available-For-Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Jun. 30, 2013
Net Investment Income [Line Items]    
Amortized cost $ 277,378 $ 531,497
Due within one year, Amortized cost 126,235  
Due after one year through five years, Amortized cost 65,345  
Due after five years, Amortized cost     
Total 277,378  
Estimated fair value 277,713 531,064
Due within one year, Estimated fair value 126,360  
Due after one year through five years, Estimated fair value 65,555  
Due after five years, Estimated fair value     
Total 277,713  
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
Estimated fair value $ 3,262 $ 63,661