Notes Payable (Tables)

6 Months Ended

Jul. 31, 2012

Schedule Of Convertible Senior Notes

The Notes consisted of the following (in thousands):

	July 31, 2012			January 31, 2012
Liability component:
Principal	$	574,890		$	574,890
Less: debt discount, net (1)		(66,357	)		(78,741	)
Net carrying amount	$	508,533		$	496,149

(1) Included in the condensed consolidated balance sheets within 0.75% convertible senior notes and is amortized over the remaining life of the Notes using the effective interest rate method.

Schedule Of Interest Expense Related To Convertible Senior Notes

The following table sets forth total interest expense recognized related to the Notes prior to capitalization of interest (in thousands):

	Three Months Ended July 31,						Six Months Ended July 31,
	2012			2011			2012			2011
Contractual interest expense	$	1,078		$	1,078		$	2,156		$	2,156
Amortization of debt issuance costs		332			331			662			661
Amortization of debt discount		6,207			5,859			12,384			11,690
	$	7,617		$	7,268		$	15,202		$	14,507
Effective interest rate of the liability component		5.86	%		5.86	%		5.86	%		5.86	%