Term Receivable and Trade Accounts Receivable Balances Term Receivables and Trade Accounts Receivable (Tables)

12 Months Ended

Jan. 31, 2013

Term Receivables and Trade Accounts Receivable [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

Term receivable and trade accounts receivable balances were as follows:

As of January 31,	2013		2012
Trade accounts receivable	$	178,351	$	133,494
Term receivables, short-term	$	233,894	$	221,430
Term receivables, long-term	$	250,497	$	220,355

Financing Receivable Credit Quality Indicators [Table Text Block]

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

As of January 31,	2013		2012
S&P credit rating:
AAA+ through BBB-	$	133,773	$	130,545
BB+ and lower	45,298		15,161
	179,071		145,706
Internal credit assessment	71,426		74,649
Total long-term term receivables	$	250,497	$	220,355

Allowance For Doubtful Accounts Table [Table Text Block]

The following shows the change in allowance for doubtful accounts for the years ended January 31, 2013, 2012, and 2011:

Allowance for doubtful accounts	Beginning balance		Charged to expense		Other changes(1)			Ending balance
Year ended January 31, 2013	$	4,432	$	1,147	$	(248	)	$	5,331
Year ended January 31, 2012	$	3,941	$	688	$	(197	)	$	4,432
Year ended January 31, 2011	$	3,607	$	369	$	(35	)	$	3,941