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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	Sep. 30, 2013
Amortized Cost
Mature in one year or less	$ 55,761
Mature after one year through two years	8,500
Total amortized cost	64,261
Estimated Fair Value
Mature in one year or less	55,778
Mature after one year through two years	8,505
Total estimated fair value	$ 64,283

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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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