Goodwill, Long-lived Assets and Other Intangibles Long-lived Assets and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Long-lived asset impairment loss	$ 0	$ 0	$ 0	$ 0
Finite-Lived Intangible Assets, Gross	31,349		31,349		$ 30,902
Finite-Lived Intangible Assets, Accumulated Amortization	(16,416)		(16,416)		(14,609)
Finite-Lived Intangible Assets, Net	14,933		14,933		16,293
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	9,174		9,174		9,203
Finite-Lived Intangible Assets, Accumulated Amortization	(7,591)		(7,591)		(7,216)
Finite-Lived Intangible Assets, Net	1,583		1,583		1,987
Customer-Related Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	16,073		16,073		15,791
Finite-Lived Intangible Assets, Accumulated Amortization	(6,529)		(6,529)		(5,508)
Finite-Lived Intangible Assets, Net	9,544		9,544		10,283
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	6,102		6,102		5,908
Finite-Lived Intangible Assets, Accumulated Amortization	(2,296)		(2,296)		(1,885)
Finite-Lived Intangible Assets, Net	$ 3,806		$ 3,806		$ 4,023