Goodwill, Long-lived Assets and Other Intangibles Long-lived Assets and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 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	31,186		31,186		$ 30,902
Finite-Lived Intangible Assets, Accumulated Amortization	(15,813)		(15,813)		(14,609)
Finite-Lived Intangible Assets, Net	15,373		15,373		16,293
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	9,172		9,172		9,203
Finite-Lived Intangible Assets, Accumulated Amortization	(7,463)		(7,463)		(7,216)
Finite-Lived Intangible Assets, Net	1,709		1,709		1,987
Customer-Related Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	16,072		16,072		15,791
Finite-Lived Intangible Assets, Accumulated Amortization	(6,188)		(6,188)		(5,508)
Finite-Lived Intangible Assets, Net	9,884		9,884		10,283
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	5,942		5,942		5,908
Finite-Lived Intangible Assets, Accumulated Amortization	(2,162)		(2,162)		(1,885)
Finite-Lived Intangible Assets, Net	$ 3,780		$ 3,780		$ 4,023