Goodwill, Long-lived Assets and Other Intangibles Long-lived Assets and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Long-lived asset impairment loss	$ 0	$ 0
Finite-Lived Intangible Assets, Gross	31,196		$ 30,902
Finite-Lived Intangible Assets, Accumulated Amortization	(15,218)		(14,609)
Finite-Lived Intangible Assets, Net	15,978		16,293
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	9,179		9,203
Finite-Lived Intangible Assets, Accumulated Amortization	(7,345)		(7,216)
Finite-Lived Intangible Assets, Net	1,834		1,987
Customer-Related Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	16,076		15,791
Finite-Lived Intangible Assets, Accumulated Amortization	(5,848)		(5,508)
Finite-Lived Intangible Assets, Net	10,228		10,283
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	5,941		5,908
Finite-Lived Intangible Assets, Accumulated Amortization	(2,025)		(1,885)
Finite-Lived Intangible Assets, Net	$ 3,916		$ 4,023