Other Financial Information (Details 2) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Allowance for Doubtful Accounts [Member]
Summary of activity in allowance for doubtful accounts
Balance at Beginning of period	$ 963	$ 1,095	$ 1,480
Additions and Charges to Expenses	262	4	50
Deductions and Write-Offs	(131)	(136)	(435)
Balance at End of period	$ 1,094	$ 963	$ 1,095