Notes Payable (Tables)

12 Months Ended

Jan. 31, 2013

Notes Payable

Notes payable consisted of the following:

As of January 31,	2013		2012
4.00% Debentures due 2031	$	218,546	$	213,224
Other	—		1,349
Notes payable	$	218,546	$	214,573

Redemption Prices Expressed as a Percentage of Principal, Plus any Accrued and Unpaid Interest

We may redeem some or all of the 4.00% Debentures for cash on or after April 5, 2016 at the following redemption prices expressed as a percentage of principal, plus any accrued and unpaid interest:

Period	Redemption Price
Beginning on April 5, 2016 and ending on March 31, 2017	101.143	%
Beginning on April 1, 2017 and ending on March 31, 2018	100.571	%
On April 1, 2018 and thereafter	100.000	%

Principal Amount, Unamortized Debt Premium (Discount), Net Carrying Amount of the Liability Component, and Carrying Amount of the Equity Component

The principal amount, unamortized debt discount, net carrying amount of the liability component, and carrying amount of the equity component of the 4.00% Debentures are as follows:

As of	January 31, 2013			January 31, 2012
Principal amount	$	253,000		$	253,000
Unamortized debt discount	(34,454		)	(39,776		)
Net carrying amount of the liability component	$	218,546		$	213,224
Equity component	$	43,930		$	43,930

4.00% Debentures due 2031

Recognized Amounts in Interest Expense in the Consolidated Statement of Operations

We recognized the following amounts in interest expense in the consolidated statement of operations related to the 4.00% debentures:

	2013		2012		2011
Interest expense at the contractual interest rate	$	10,120	$	8,349	$	—
Amortization of debt discount	$	5,322	$	4,154	$	—

6.25% Debentures due 2026, issued 2006

Recognized Amounts in Interest Expense in the Consolidated Statement of Operations

We recognized the following amounts in interest expense in the consolidated statements of operations related to the 6.25% Debentures, issued 2006:

Year ended January 31,	2013		2012		2011
Interest expense at the contractual interest rate	$	—	$	2,900	$	10,322
Amortization of debt discount	$	—	$	793	$	3,010