Acquisitions, Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands				3 Months Ended
	Nov. 01, 2019	Oct. 01, 2019	Sep. 13, 2019	Apr. 30, 2020	Apr. 30, 2019	Jan. 31, 2020
Business Acquisition
Common stock, shares issued				158,841,311		157,787,548
Goodwill				$ 1,292,840		$ 1,292,840
Amortization of intangible assets				$ 14,700	$ 7,100
SignalFx
Business Acquisition
Percentage of voting interests acquired		100.00%
Purchase price		$ 961,400
Purchase price paid in cash		619,100
Fair value of replacement equity awards attributable to pre-acquisition service		$ 324,500
Common stock, shares issued		2,771,482
Fair value of replacement equity awards attributable to pre-acquisition service		$ 17,800
Acquired fair value of finite-lived intangible assets		173,700
Net assets acquired		62,100
Net deferred tax liabilities assumed		3,300
Goodwill		728,900
Replacement equity awards		$ 104,700
Omnition
Business Acquisition
Percentage of voting interests acquired			100.00%
Purchase price			$ 52,500
Purchase price paid in cash			31,600
Fair value of replacement equity awards attributable to pre-acquisition service			$ 20,200
Common stock, shares issued			176,989
Fair value of replacement equity awards attributable to pre-acquisition service			$ 700
Acquired fair value of finite-lived intangible assets			8,000
Goodwill			44,500
Replacement equity awards			$ 36,600
Streamlio
Business Acquisition
Percentage of voting interests acquired	100.00%
Purchase price	$ 19,800
Purchase price paid in cash	18,700
Fair value of replacement equity awards attributable to pre-acquisition service	1,100
Acquired fair value of finite-lived intangible assets	3,600
Net assets acquired	100
Goodwill	16,100
Replacement equity awards	$ 4,200