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Marketable Securities - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Gain (Loss) on Investments [Line Items]
Gross realized gains on sales of available-for-sale marketable securities	$ 15,000	$ 24,000	$ 10,000
Other than temporary impairment of minority equity investment			200,000
Loss on sale of minority equity investment			$ 200,000

The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence.

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- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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