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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
Sep. 30, 2014
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 236,127 $ 270,224
Due within one year, Amortized cost 89,722  
Due after one year through five years, Amortized cost 53,928  
Due after five years, Amortized cost     
Total 236,127  
Estimated fair value 236,357 270,586
Due within one year, Estimated fair value 89,807  
Due after one year through five years, Estimated fair value 54,073  
Due after five years, Estimated fair value     
Total 236,357  
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
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