Senior and Subordinated Debt (Tables)

12 Months Ended

Jan. 31, 2013

Debt Disclosure [Abstract]

Schedule of senior and subordinated debt

The following table summarizes the Company’s senior and subordinated debt:

	January 31,
	2013		2012
	(in thousands)
Senior Notes:
3.625% Puttable Equity-Linked Senior Notes due 2014, net of discount	$	199,457	$	199,132
7.625% Senior Notes due 2015	53,253		178,253
5.000% Convertible Senior Notes due 2016	50,000		50,000
6.500% Senior Notes due 2017	132,144		132,144
4.250% Convertible Senior Notes due 2018	350,000		350,000
7.375% Senior Notes due 2034, net of discount	219,115		100,000
Total Senior Notes	1,003,969		1,009,529
Subordinated Debt:
Subordinate Tax Revenue Bonds due 2013	29,000		29,000
Total Senior and Subordinated Debt	$	1,032,969	$	1,038,529

Summary of Interest Incurred Capitalized and Paid

The following table summarizes interest incurred, capitalized and paid on all forms of indebtedness (included in Notes E, G and H).

	Years Ended January 31,
	2013			2012			2011
	(in thousands)
Interest incurred	$	365,323		$	443,247		$	470,865
Interest capitalized	(96,094		)	(193,448		)	(172,664		)
Net interest expense	$	269,229		$	249,799		$	298,201
Interest incurred from discontinued operations	$	7,262		$	14,175		$	22,969
Cash paid for interest (net of amount capitalized)	$	291,509		$	260,822		$	318,910