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Accounting Standards - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Apr. 30, 2021	Feb. 01, 2021	Jan. 31, 2021	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	$ 3,867,990			$ 3,277,834	$ 2,838,478
Debt, current	1,201,964			1,103,101
Property, plant and equipment, decrease	(1,135,593)			(972,403)
2022 Notes | Convertible Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contractual interest rate			0.25%					0.25%
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt, current			$ 79,000
Property, plant and equipment, decrease			5,000
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	(2,714,744)	$ (2,820,480)		(2,909,990)	(2,813,943)	$ (2,785,927)	$ (2,627,359)
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity				136,032			(200)
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity			136,000
Additional Paid-In Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	$ 6,639,067	$ 6,298,516		6,254,936	$ 5,954,738	$ 5,330,170	$ 5,090,187
Additional Paid-In Capital | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity				$ (219,702)
Additional Paid-In Capital | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity			$ (220,000)

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Contractual interest rate for funds borrowed, under the debt agreement.

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