Goodwil, Long-lived Assets, and Other Charges - Gross Carrying Amount and Related Accumulated Amortization of Definite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	$ 63,235	$ 30,902
Accumulated Amortization	(17,018)	(14,609)
Intangible assets, net	46,217	16,293
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	31,300	0
Accumulated Amortization	0	0
Existing Technology
Finite-Lived Intangible Assets [Line Items]
Amount	9,190	9,203
Accumulated Amortization	(7,706)	(7,216)
Net	1,484	1,987
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Amount	16,067	15,791
Accumulated Amortization	(6,868)	(5,508)
Net	9,199	10,283
Patented Technology
Finite-Lived Intangible Assets [Line Items]
Amount	6,678	5,908
Accumulated Amortization	(2,444)	(1,885)
Net	$ 4,234	$ 4,023