Schedule II - Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015		Jan. 31, 2014		Jan. 31, 2013
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 319		$ 205		$ 170
Charged to Costs and Expenses	211		129		355
Charged to Other Accounts	19		0		0
Deductions From Reserves	230	[1]	15	[1]	320	[1]
Balance at End of Year	$ 319		$ 319		$ 205

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