Goodwill and Intangible Assets - Details of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2020	Jan. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 171,176	$ 174,670
Accumulated amortization	(46,756)	(40,069)
Total	124,420	134,601
Existing technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	26,180	26,380
Accumulated amortization	(6,480)	(4,808)
Total	$ 19,700	$ 21,572
Remaining useful life (in years)	5 years 3 months 18 days	5 years 9 months 18 days
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 110,643	$ 111,443
Accumulated amortization	(22,227)	(17,575)
Total	$ 88,416	$ 93,868
Remaining useful life (in years)	8 years 6 months	9 years
Trade name/Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 13,900	$ 13,900
Accumulated amortization	(2,240)	(720)
Total	$ 11,660	$ 13,180
Remaining useful life (in years)	4 years 1 month 6 days	4 years 8 months 12 days
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 20,453	$ 22,947
Accumulated amortization	(15,809)	(16,966)
Total	$ 4,644	$ 5,981
Remaining useful life (in years)	5 years 3 months 18 days	5 years