Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands		12 Months Ended
		Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		$ 319	$ 319	$ 205
Charged to Costs and Expenses		1,066	211	129
Charged to Other Accounts		0	19	0
Deductions From Reserves	[1]	351	230	15
Balance at End of Year		$ 1,034	$ 319	$ 319

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