Debt Security Investments (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Amortized cost and fair value of debt security investments, by contractual maturity
Due in one year or less, Amortized Cost	$ 56,585
Due in one year or less, Fair Value	56,583
Due after one year through five years, Amortized Cost	19,424
Due after one year through five years, Fair Value	19,447
Total debt security investments, Amortized Cost	76,009
Total debt security investments, Fair Value	$ 76,030

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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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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- Definition

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

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