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Derivative Instruments and Hedging Activities (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Not Designated as Hedging Instrument [Member]
Impact of gains and losses related to derivative instruments
Net Gain (Loss) Recognized Derivatives	$ 4,098	$ 844
Total Return Swap [Member] \| Fair Value Hedging [Member]
Impact of gains and losses related to derivative instruments
Net Gain (Loss) Recognized Derivatives	(145)	1,482
Total Return Swap [Member] \| Not Designated as Hedging Instrument [Member]
Impact of gains and losses related to derivative instruments
Net Gain (Loss) Recognized Derivatives	4,303	1,040
Interest rate caps, interest rate swaps and floors [Member] \| Not Designated as Hedging Instrument [Member]
Impact of gains and losses related to derivative instruments
Net Gain (Loss) Recognized Derivatives	$ (205)	$ (196)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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