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Summary of Amortized Cost and Estimated Fair Value of Marketable Securities Available-for-sale (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Amortized cost
Mature in one year or less	$ 61,367
Mature after one year through two years	18,953
Total amortized cost	80,320
Estimated Fair Value
Mature in one year or less	61,393
Mature after one year through two years	18,964
Total estimated fair value	$ 80,357

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth 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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