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Notes Payable (Tables) (4.00% Debentures due 2031)
 12 Months Ended
Jan. 31, 2015
4.00% Debentures due 2031
  
Debt Instrument  
Redemption Prices
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, 2015
 
January 31, 2014
Principal amount
$
253,000

 
$
253,000

Unamortized debt discount
(22,600
)
 
(28,739
)
Net carrying amount of the liability component
$
230,400

 
$
224,261

Equity component
$
43,930

 
$
43,930
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:
 
Year ended January 31,
2015
 
2014
 
2013
Interest expense at the contractual interest rate
$
10,120

 
$
10,120

 
$
10,120

Amortization of debt discount
$
6,139

 
$
5,715

 
$
5,322