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Net Loss Per Share Narrative (Details) - $ / shares	Jan. 31, 2020	Feb. 28, 2018
Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Class of warrant or right, exercise price of warrants or rights		$ 68.06
Convertible Senior Notes Due 2023 | Senior Notes
Debt Instrument [Line Items]
Conversion price (in dollars per share)		$ 48.36
Convertible Senior Notes Due 2025 | Senior Notes
Debt Instrument [Line Items]
Conversion price (in dollars per share)	$ 188.71

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ 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
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-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870

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