Investments (Components Of Other Comprehensive Income Related To Available-For-Sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Other Comprehensive Income Related to Available-For-Sale Securities [Roll Forward]
Accumulated OCI related to available-for-sale securities, beginning of year	$ 13,240	$ 21,032	$ 10,302
Unrealized gains on available-for-sale securities	(305)	6,950	20,048
Reclassification adjustment for (gains) losses included in net loss	(21,329)	(15,483)	(3,582)
Changes in accumulated OCI on available-for-sale securities, before tax	(21,634)	(8,533)	16,466
Other comprehensive income (loss) attributable to noncontrolling interest	3	26	53
Deferred income tax benefit (provision)	0	715	(5,789)
Changes in accumulated OCI on available-for-sale securities, net of tax	(21,631)	(7,792)	10,730
Accumulated OCI related to available-for-sale securities, end of year	$ (8,391)	$ 13,240	$ 21,032

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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Gross appreciation or the gross loss in value of the total of unsold available-for-sale securities (except when designated as a fair value hedge or which had been determined to have had an other than temporary decline in fair value below its amortized cost basis) attributable to noncontrolling interest.

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- Definition

Gross appreciation or the gross loss in value of the total unsold securities, after tax, attributable to the parent entity.

+ References

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- Definition

Pre tax reclassification adjustment for gains or losses realized upon the sale of securities.

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- Definition

Gross appreciation or the gross loss in value of the total of unsold available-for-sale securities during the period being reported (except when designated as a fair value hedge).

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+ Details

- Definition

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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