Investments (Tables)

9 Months Ended

12 Months Ended

Oct. 31, 2011

Jan. 31, 2011

Investments [Abstract]

Summary Of Available-For-Sale Securities

	October 31, 2011
			Included in Accumulated Other Comprehensive Income
	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Cumulative Impairment Charges			Estimated Fair Value
	(In thousands)
Short-term:
Auction rate securities - Student loans	$	46,150	$	12,605	$	—	$	(16,170	)	$	42,585
Auction rate securities - Corporate issuers		22,500		4,616		—		(19,442	)		7,674
Total short-term investments	$	68,650	$	17,221	$	—	$	(35,612	)	$	50,259

	January 31, 2011
			Included in Accumulated Other Comprehensive Income
	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Cumulative Impairment Charges			Estimated Fair Value
	(In thousands)
Short-term:
Auction rate securities - Student loans	$	71,900	$	16,044	$	—	$	(24,181	)	$	63,763
Auction rate securities - Corporate issuers		22,500		5,619		—		(19,441	)		8,678
Total short-term investments	$	94,400	$	21,663	$	—	$	(43,622	)	$	72,441

Gross Realized Gains And Losses On Investments

	Three Months Ended October 31,				Nine Months Ended October 31,
	Gross Realized Gains		Gross Realized Losses		Gross Realized Gains		Gross Realized Losses
	(In thousands)
2011	$	120	$	—	$	8,011	$	—
2010	$	1,625	$	—	$	23,715	$	—

Components Of Other Comprehensive Income Related To Available-For-Sale Securities

	Three Months Ended October 31,						Nine Months Ended October 31,
	2011			2010			2011			2010
	(In thousands)
Accumulated OCI related to available-for-sale securities, beginning of the period	$	14,891		$	13,747		$	17,871		$	25,663
Unrealized gains on available-for-sale securities		(1,376	)		1,202			(287	)		3,915
Reclassification adjustment for gains included in net income/(loss)		(87	)		(57	)		(4,156	)		(15,419	)
Changes in accumulated OCI on available-for-sale securities, before tax		(1,463	)		1,145			(4,443	)		(11,504	)
Other comprehensive income attributable to noncontrolling interest		—			—			—			24
Deferred income tax benefit		—			3			—			712
Changes in accumulated OCI on available-for-sale securities, net of tax		(1,463	)		1,148			(4,443	)		(10,768	)
Accumulated OCI related to available-for-sale securities, end of the period	$	13,428		$	14,895		$	13,428		$	14,895