Schedule II - Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012		Jan. 31, 2011		Jan. 31, 2010
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 300		$ 297		$ 613
Charged to Costs and Expenses	(91)		(1)		(183)
Charged to Other Accounts	0		0		0
Deductions From Reserves	39	[1]	(4)	[1]	133	[1]
Balance at End of Year	$ 170		$ 300		$ 297

[1] Represents uncollectible accounts receivable written off during the year, net of recoveries.