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Other Income - Narrative (Detail) (USD $)	1 Months Ended		12 Months Ended
Other Income - Narrative (Detail) (USD $)	Sep. 30, 2012	Mar. 21, 2011	Jan. 31, 2012
Component of Other Income, Nonoperating [Line Items]
Gain on the sale of the facility		$ 6,354,000
Deferred gain on sale of facility to match the expected lease payments under the leasehold agreement		1,379,000
Deferred gain recognized on sale of facility	$ 651,000		$ 421,000
Deferred gain recognition period			36 months

The gains (losses) included in results of operations resulting from the sale or disposal of property, plant and equipment, which do not qualify for treatment as discontinued operations. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.

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