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Assets Held for Sale - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2011
Long Lived Assets Held-for-sale [Line Items]
Depreciation expense	$ 92,000

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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