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Debt - Carrying Amount Of Equity Component (Details) - Convertible Debt - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Proceeds allocated to the conversion option (debt discount)	$ 134,667	$ 134,667
Less: extinguishment or conversion	(31,933)	0
Less: transaction costs	(3,336)	(3,336)
Net carrying value of mezzanine and permanent equity component	99,398	$ 131,331
Excess of if-converted value over principal	$ 259,578
Debt interest rate percentage	5.90%	5.90%
Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Proceeds allocated to the conversion option (debt discount)	$ 64,453
Less: transaction costs	(1,185)
Net carrying value of mezzanine and permanent equity component	63,268
Excess of if-converted value over principal	$ 0
Debt interest rate percentage	3.80%

X

- Definition

Debt Instrument, Convertible, Gross Amount Of Equity Component

+ References

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- Definition

Debt Instrument, Face Amount Of Equity Component

+ References

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- Definition

Debt Issuance Costs, Equity Component Of Convertible Debt

+ References

No definition available.

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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

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- Definition

The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
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-Name Accounting Standards Codification
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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