Schedule of Maturities of Debt Securities Classified as Cash Equivalents and Available-For-Sale (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Net Investment Income [Line Items]
Amortized cost	$ 270,224	$ 531,497
Due within one year, Amortized cost	121,505
Due after one year through five years, Amortized cost	83,899
Due after five years, Amortized cost
Total	270,224
Estimated fair value	270,586	531,064
Due within one year, Estimated fair value	121,641
Due after one year through five years, Estimated fair value	84,124
Due after five years, Estimated fair value
Total	270,586
Cash
Net Investment Income [Line Items]
Amortized cost	45,181	40,412
Estimated fair value	45,181	40,412
Cash Equivalents
Net Investment Income [Line Items]
Amortized cost	19,639	63,653
Estimated fair value	$ 19,640	$ 63,661