Summary of Cost and Estimated Fair Values of Short Term Fixed Income Securities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Amortized Cost
Less than 1 year	$ 8,828
Due in 1 to 5 years	94,653
Total	103,481
Estimated Fair Value
Less than 1 year	8,834
Due in 1 to 5 years	94,770
Total	$ 103,604

Available For Sale Securities Debt Maturities After One Year Through Three Years Amortized Cost Basis

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Available For Sale Securities Debt Maturities Due After One Year Through Three Years Fair Value

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Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the next fiscal year following the latest fiscal year.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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