Intangible Assets and Goodwill - Details of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 174,670	$ 54,470
Intangible assets, Accumulated amortization	(40,069)	(29,949)
Intangible assets, Net	134,601	24,521
Existing technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	26,380	3,880
Intangible assets, Accumulated amortization	(4,808)	(3,834)
Intangible assets, Net	$ 21,572	$ 46
Intangible assets, Remaining useful life	5 years 9 months 18 days	1 year 2 months 12 days
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 111,443	$ 33,643
Intangible assets, Accumulated amortization	(17,575)	(12,350)
Intangible assets, Net	$ 93,868	$ 21,293
Intangible assets, Remaining useful life	9 years	6 years 7 months 6 days
Trade name/Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 13,900
Intangible assets, Accumulated amortization	(720)
Intangible assets, Net	$ 13,180
Intangible assets, Remaining useful life	4 years 8 months 12 days
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 22,947	$ 16,947
Intangible assets, Accumulated amortization	(16,966)	(13,765)
Intangible assets, Net	$ 5,981	$ 3,182
Intangible assets, Remaining useful life	5 years	1 year 2 months 12 days