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Term Receivables and Trade Accounts Receivable (Tables)
3 Months Ended
Apr. 30, 2012
Notes To Financial Statements [Abstract]  
Term Receivable and Trade Accounts Receivable Balances
Term receivable and trade accounts receivable balances were as follows:

As of
April 30, 2012
 
January 31, 2012
Trade accounts receivable
$
117,981

 
$
133,494

Term receivables, short-term
$
236,938

 
$
221,430

Term receivables, long-term
$
212,665

 
$
220,355

Credit Risk Assessment for Long-term Receivables
The credit risk assessment for our long-term receivables was as follows:
 
As of
April 30, 2012
 
January 31, 2012
S&P credit rating:
 
 
 
AAA+ through BBB-
$
134,324

 
$
130,545

BB+ and lower
18,211

 
15,161

 
152,535

 
145,706

Internal credit assessment
60,130

 
74,649

Total long-term term receivables
$
212,665

 
$
220,355

Change in Allowance for Doubtful Accounts
The following shows the change in allowance for doubtful accounts:
 
Allowance for doubtful accounts
 
Beginning balance
 
Charged 
to expense
 
Deductions(1)
 
Ending balance
Three months ended April 30, 2012
 
$
4,432

 
$
153

 
$
(48
)
 
$
4,537

(1)Specific account write-offs and foreign exchange.