Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands		12 Months Ended
		Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		$ 691	$ 1,034	$ 319
Charged to Costs and Expenses		357	380	1,066
Charged to Other Accounts		0	0	0
Deductions From Reserves	[1]	70	723	351
Balance at End of Year		$ 978	$ 691	$ 1,034

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