Term Receivables and Trade Accounts Receivable (Tables)

12 Months Ended

Jan. 31, 2012

Term Receivable and Trade Accounts Receivable Balances

Term receivable and trade accounts receivable balances were as follows:

As of January 31,	2012		2011
Trade accounts receivable	$	133,494	$	153,733
Term receivables, short-term	$	221,430	$	193,342
Term receivables, long-term	$	220,355	$	167,425

Credit Risk Assessment for Long-term Receivables

The credit risk assessment for our long-term receivables was as follows:

As of January 31,	2012		2011
S&P credit rating:
AAA+ through BBB-	$	130,545	$	84,685
BB+ and lower		15,161		19,473
		145,706		104,158
Internal credit assessment		74,649		63,267
Total long-term term receivables	$	220,355	$	167,425

Change in Allowance for Doubtful Accounts

The following shows the change in allowance for doubtful accounts for the years ended January 31, 2012, 2011, and 2010:

Allowance for doubtful accounts	Beginning balance		Charged to expense			Other changes(1)			Ending balance
Year ended January 31, 2012	$	3,941	$	688		$	(197	)	$	4,432
Year ended January 31, 2011	$	3,607	$	369		$	(35	)	$	3,941
Year ended January 31, 2010	$	5,515	$	(15	)	$	(1,893	)	$	3,607

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