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Term Receivables and Trade Accounts Receivable (Tables)
3 Months Ended
Apr. 30, 2015
Term Receivables and Trade Accounts Receivable [Abstract]  
Term receivable and trade accounts receivable balances
Term receivable and trade accounts receivable balances were as follows:
As of
April 30, 2015
 
January 31, 2015
Trade accounts receivable
$
90,050

 
$
208,996

Term receivables, short-term
$
347,880

 
$
337,626

Term receivables, long-term
$
282,343

 
$
301,862

Credit risk assessment for long-term receivables
The credit risk assessment for our long-term receivables was as follows:
As of
April 30, 2015
 
January 31, 2015
S&P credit rating:
 
 
 
AAA+ through BBB-
$
176,171

 
$
192,430

BB+ and lower
41,658

 
31,939

 
217,829

 
224,369

Internal credit assessment
64,514

 
77,493

Total long-term term receivables
$
282,343

 
$
301,862

Change in allowance for doubtful accounts
The following shows the change in allowance for doubtful accounts:
Allowance for doubtful accounts
 
Beginning balance
 
Expense adjustment
 
Other deductions(1)
 
Ending balance
Three months ended April 30, 2015
 
$
4,217

 
$
(636
)
 
$
4

 
$
3,585

Three months ended April 30, 2014
 
$
5,469

 
$
(1,744
)
 
$
(241
)
 
$
3,484

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