Goodwill and Intangible Assets - Details of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2021	Jan. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 172,842	$ 171,176
Accumulated amortization	(65,589)	(56,581)
Total	107,253	114,595
Existing technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	26,180	26,180
Accumulated amortization	(10,226)	(8,367)
Total	$ 15,954	$ 17,813
Remaining useful life (in years)	4 years 3 months 18 days	4 years 9 months 18 days
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 111,357	$ 110,643
Accumulated amortization	(33,177)	(27,741)
Total	$ 78,180	$ 82,902
Remaining useful life (in years)	7 years 6 months	8 years
Trade name/trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 13,900	$ 13,900
Accumulated amortization	(5,315)	(4,005)
Total	$ 8,585	$ 9,895
Remaining useful life (in years)	3 years 3 months 18 days	3 years 9 months 18 days
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 21,405	$ 20,453
Accumulated amortization	(16,871)	(16,468)
Total	$ 4,534	$ 3,985
Remaining useful life (in years)	5 years 4 months 24 days	5 years 1 month 6 days