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Convertible Senior Notes, Net (Schedule of Interest Expense Recognized Related to Convertible Senior Notes) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Debt Instrument [Line Items]
Interest cost related to amortization of the debt discount	$ 59,974	$ 43,916	$ 26,947
2018 Notes
Debt Instrument [Line Items]
Contractual interest expense	1,196	2,625	2,625
Interest cost related to amortization of debt issuance costs	641	1,409	1,408
Interest cost related to amortization of the debt discount	7,850	16,530	15,607
2020 Notes
Debt Instrument [Line Items]
Contractual interest expense	3,750	3,750	3,750
Interest cost related to amortization of debt issuance costs	673	673	675
Interest cost related to amortization of the debt discount	10,488	9,852	9,257
2022 Notes
Debt Instrument [Line Items]
Contractual interest expense	2,875	1,086	0
Interest cost related to amortization of debt issuance costs	2,858	1,080	0
Interest cost related to amortization of the debt discount	$ 40,939	$ 14,989	$ 0

X

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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