Income Taxes (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Jan. 31, 2013
Income Taxes (Textual) [Abstract]
Income tax expense (benefit)	$ (15,222)	$ 9,848
Net operating loss carryforward			212,271
Net operating loss carryforward expiration dates			years ending January 31, 2026 through January 31, 2033
Charitable contribution deduction carryforward			27,326
Charitable contribution deduction carryforward expiration dates			years ending January 31, 2014 through January 31, 2018
General business credit carryovers			21,159
General business credit carryovers expiration dates			years ending January 31, 2019 through January 31, 2033
Alternative Minimum Tax credit carryforward			27,452
Net deferred tax asset unrecognized			$ 17,299