Condensed Statements of Operations (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2010	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Selling, general and administrative expenses									$ (582,878)	$ (689,306)	$ (721,731)
Income (loss) from operations	16,267	32,130	12,062	(33,424)	23,525	23,302	(13,050)	(83,692)	27,035	(49,915)	(193,101)
Interest expense									(33,332)	(30,813)	(25,381)
Other-than-temporary impairment of investments									0	(407)	(6,914)
Income (loss) before income tax benefit (provision)									11,932	(70,231)	(228,215)
Income tax benefit									(42,951)	(37,232)	7,025
Equity in gains (losses) of subsidiaries from continuing operations, net of tax									64	(20)	(6)
Net income (loss) from continuing operations									(31,019)	(107,463)	(221,190)
Loss from discontinued operations, net of tax									0	(11,039)	(43,062)
Net income (loss)									(31,019)	(118,502)	(264,252)
Basic and diluted									208,301,686,000	205,162,720,000	204,513,420,000
Continuing operations					$ 0.10	$ (0.20)	$ (0.12)	$ (0.39)	$ (0.28)	$ (0.61)	$ (1.13)
Discontinued operations					$ (0.02)	$ 0.00	$ 0.00	$ (0.01)	$ 0.00	$ (0.03)	$ (0.20)
Basic loss per share	$ 0.02	$ 0.17	$ (0.19)	$ (0.29)	$ 0.08	$ (0.20)	$ (0.12)	$ (0.40)	$ (0.28)	$ (0.64)	$ (1.33)
Continuing operations					$ 0.09	$ (0.21)	$ (0.12)	$ (0.39)	$ (0.28)	$ (0.62)	$ (1.13)
Discontinued operations					$ (0.02)	$ 0.00	$ 0.00	$ (0.01)	$ 0.00	$ (0.03)	$ (0.20)
Diluted loss per share	$ 0.02	$ 0.17	$ (0.19)	$ (0.29)	$ 0.07	$ (0.21)	$ (0.12)	$ (0.40)	$ (0.28)	$ (0.65)	$ (1.33)
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Management fees									0	0	60
Selling, general and administrative expenses									(73,753)	(84,504)	(49,291)
Litigation settlement									(4,880)	17,500	0
Income (loss) from operations									(78,633)	(67,004)	(49,231)
Interest income									1,758	1,922	3,271
Interest expense									(14)	(10)	(103)
Other-than-temporary impairment of investments									0	(407)	(6,914)
Other income									29,587	17,184	92
Income (loss) before income tax benefit (provision)									(47,302)	(48,315)	(52,885)
Income tax benefit									5,675	4,445	47,617
Equity in gains (losses) of subsidiaries from continuing operations, net of tax									(17,099)	(81,747)	(225,162)
Net income (loss) from continuing operations									(58,726)	(125,617)	(230,430)
Loss from discontinued operations, net of tax									0	(6,705)	(41,605)
Net income (loss)									$ (58,726)	$ (132,322)	$ (272,035)
Basic and diluted									208,301,686	205,162,720	204,513,420
Continuing operations									$ (0.28)	$ (0.61)	$ (1.13)
Discontinued operations									$ 0.00	$ (0.03)	$ (0.20)
Basic loss per share									$ (0.28)	$ (0.64)	$ (1.33)
Continuing operations									$ (0.28)	$ (0.62)	$ (1.13)
Discontinued operations									$ 0.00	$ (0.03)	$ (0.20)
Diluted loss per share									$ (0.28)	$ (0.65)	$ (1.33)