Goodwill and Intangible Assets - Details of Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2020	Jan. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 174,670	$ 174,670
Accumulated amortization	(45,267)	(40,069)
Total	129,403	134,601
Existing technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	26,380	26,380
Accumulated amortization	(5,737)	(4,808)
Total	$ 20,643	$ 21,572
Remaining useful life (in years)	5 years 6 months	5 years 9 months 18 days
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 111,443	$ 111,443
Accumulated amortization	(20,272)	(17,575)
Total	$ 91,171	$ 93,868
Remaining useful life (in years)	8 years 8 months 12 days	9 years
Trade name/Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 13,900	$ 13,900
Accumulated amortization	(1,426)	(720)
Total	$ 12,474	$ 13,180
Remaining useful life (in years)	4 years 4 months 24 days	4 years 8 months 12 days
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 22,947	$ 22,947
Accumulated amortization	(17,832)	(16,966)
Total	$ 5,115	$ 5,981
Remaining useful life (in years)	5 years 3 months 18 days	5 years