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Investments (Tables)

6 Months Ended

Mar. 31, 2013

Investments [Abstract]

Summary of investments by type of security

The following table summarizes investments by type of security as of March 31, 2013:

		Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Market Value
Available-for-sale securities:
Corporate debt securities, short-term		$	4,899,835			$	2,348			$	(857	)		$	4,901,326
Corporate debt securities, long-term			417,587				429				—				418,016
Total		$	5,317,422			$	2,777			$	(857	)		$	5,319,342

The following table summarizes investments by type of security as of September 30, 2012:

		Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Market Value
Available-for-sale securities:
Corporate debt securities, short-term		$	5,818,549			$	3,343			$	(2,355	)		$	5,819,537
Corporate debt securities, long-term			2,087,294				684				(2,288	)			2,085,690
Total		$	7,905,843			$	4,027			$	(4,643	)		$	7,905,227

Summary of fair value of investments measured on recurring basis

		March 31, 2013				September 30, 2012
Short-term investments:
Corporate debt securities
Financial		$	2,219,654			$	1,604,618
Industrial			1,171,982				2,264,934
Utility			411,168				—
Commercial paper
Industrial			748,781				348,817
Financial			349,741				1,197,730
Certificate of deposit—financial			—				403,438
Total short-term investments		$	4,901,326			$	5,819,537
Long-term investments:
Corporate debt securities
Financial		$	418,016			$	1,237,992
Industrial			—				426,974
Utility			—				420,724
Total long-term investments		$	418,016			$	2,085,690

X

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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