Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016		Jan. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 1,034	$ 319		$ 319
Charged to Costs and Expenses	380	1,066		211
Charged to Other Accounts	0	0		19
Deductions From Reserves	723	351	[1]	230	[1]
Balance at End of Year	$ 691	$ 1,034		$ 319

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