Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands	Feb. 01, 2021	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 37,365	$ 41,194
Operating lease, liability		40,715
Property and equipment, net		53,042	57,841
Finance lease, right-of-use asset		23,514	27,489
Finance lease, liability		43,690
Cumulative effect adjustment		1,068,989	739,508	$ 666,700	$ (5,033)
Convertible senior notes, net		1,143,273	1,139,880
Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Temporary equity, period increase (decrease)	$ 4,700
Accounting Standards Update 2020-06 | Convertible Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt instrument, increase (decrease), net	261,500
Cumulative effect of accounting change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment					(256,746)
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment		(1,711,632)	(1,535,032)	(1,189,634)	(935,403)
Accumulated Deficit | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity, period increase (decrease)	52,600
Accumulated Deficit | Cumulative effect of accounting change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment					52,635
Additional Paid-In Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment		$ 2,777,322	$ 2,276,694	$ 1,860,514	932,332
Additional Paid-In Capital | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity, period increase (decrease)	$ 309,400
Additional Paid-In Capital | Cumulative effect of accounting change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment					$ (309,381)