Senior and Subordinated Debt (Tables)

9 Months Ended

Oct. 31, 2013

Debt Disclosure [Abstract]

Schedule of senior and subordinated debt

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

	October 31, 2013		January 31, 2013
	(in thousands)
Senior Notes:
3.625% Puttable Equity-Linked Senior Notes due 2014, net of discount	$	1,112	$	199,457
7.625% Senior Notes due 2015	—		53,253
5.000% Convertible Senior Notes due 2016	50,000		50,000
6.500% Senior Notes due 2017	—		132,144
4.250% Convertible Senior Notes due 2018	350,000		350,000
3.625% Convertible Senior Notes due 2020	300,000		—
7.375% Senior Notes due 2034, net of discount	—		219,115
Total Senior Notes	701,112		1,003,969
Subordinated Debt:
Subordinate Tax Revenue Bonds due 2013	—		29,000
Total Senior and Subordinated Debt	$	701,112	$	1,032,969