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Other Operating Income and Expenses (detail) (USD $)	12 Months Ended					12 Months Ended
Other Operating Income and Expenses (detail) (USD $)	Mar. 31, 2012 LeSueur Mn [Member]	Mar. 31, 2013 Other Operating Expense [Member]	Mar. 31, 2012 Other Operating Expense [Member]	Mar. 31, 2011 Other Operating Expense [Member]	Mar. 31, 2011 Reversal of Environmental Reserve [Member]	Mar. 31, 2013 Independent Foods [Member]	Mar. 31, 2011 Lebanon [Member]	Mar. 31, 2013 Cambria, WI [Member]
Component of Operating Other Cost and Expense [Line Items]
Gain on sale of other assets				$ 249,000	$ 250,000
Loss On Sale Of Other Assets		252,000	149,000	391,000
Gain on Disposition of Property	665,000							252,000
Gain on Purchase of Business						$ 1,971,000	$ 736,000

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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