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Discontinued Operations - Narrative (Detail) (USD $)	12 Months Ended		1 Months Ended	3 Months Ended		1 Months Ended
Discontinued Operations - Narrative (Detail) (USD $)	Jan. 31, 2013	Jan. 31, 2011	Oct. 31, 2012 Energy [Member]	Jul. 31, 2012 Energy [Member]	Jan. 31, 2013 Energy [Member]	Oct. 31, 2012 Energy [Member] Natural Gas Price [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operation based on the difference between the carrying value as a continuing operation and the expected selling price, less costs to sell	$ 32,589,000			$ 32,589,000
Tax benefit related to the loss from discontinued operation				12,541,000
Sale price for discontinued operation			15,000,000
Proceeds from sale of business	13,500,000	4,800,000	13,500,000
Potential cash proceeds			1,500,000			2,000,000
Minimum agreed upon natural gas price for contingent consideration of additional proceeds						5.25
Accrual associated with certain litigation claims related to discontinued operations					$ 3,900,000

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

Amount of tax expense or benefit on gain (loss), not previously recognized, resulting from the sale of a business component.