Goodwill and Intangible Assets - Details of Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2021	Jan. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 171,176	$ 171,176
Accumulated amortization	(61,010)	(56,581)
Total	110,166	114,595
Existing technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	26,180	26,180
Accumulated amortization	(9,281)	(8,367)
Total	$ 16,899	$ 17,813
Remaining useful life (in years)	4 years 6 months	4 years 9 months 18 days
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 110,643	$ 110,643
Accumulated amortization	(30,414)	(27,741)
Total	$ 80,229	$ 82,902
Remaining useful life (in years)	7 years 9 months 18 days	8 years
Trade name/trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 13,900	$ 13,900
Accumulated amortization	(4,649)	(4,005)
Total	$ 9,251	$ 9,895
Remaining useful life (in years)	3 years 6 months	3 years 9 months 18 days
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 20,453	$ 20,453
Accumulated amortization	(16,666)	(16,468)
Total	$ 3,787	$ 3,985
Remaining useful life (in years)	4 years 10 months 24 days	5 years 1 month 6 days