Schedule II - Valuation and Qualifying Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Thousands		12 Months Ended
		Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		$ 978	$ 691	$ 1,034
Charged to Costs and Expenses		37	357	380
Charged to Other Accounts		0	0	0
Deductions From Reserves	[1]	276	70	723
Balance at End of Year		$ 739	$ 978	$ 691

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