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Accounting Standards and Significant Accounting Policies (Detail) - USD ($)	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017	Feb. 01, 2018	Sep. 30, 2017	Jun. 30, 2013
Accounting Policies [Line Items]
Period to pay portion of total arrangement fee, days	30 days
Current unearned revenue anticipated recognition term, months	12 months
Advertising expense	$ 51,000,000	$ 43,000,000	$ 35,000,000
2018 Notes
Accounting Policies [Line Items]
Convertible senior notes, interest rate	0.75%					0.75%
Convertible Senior Notes, principal amount	$ 0	350,000,000				$ 350,000,000.0
2020 Notes
Accounting Policies [Line Items]
Convertible senior notes, interest rate	1.50%					1.50%
Convertible Senior Notes, principal amount	$ 249,975,000	250,000,000				$ 250,000,000.0
2022 Notes
Accounting Policies [Line Items]
Convertible senior notes, interest rate	0.25%				0.25%
Convertible Senior Notes, principal amount	$ 1,150,000,000	$ 1,150,000,000			$ 1,150,000,000.00
Minimum
Accounting Policies [Line Items]
Subscriptions contract period, years	3 years
Accounting Standards Update 2014-09
Accounting Policies [Line Items]
Amortization period, deferred commissions	5 years
Accounting Standards Update 2016-16
Accounting Policies [Line Items]
Cumulative effect of new accounting principle				$ 400,000

X

- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Face (par) amount of debt instrument at time of issuance.

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

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Accounting Policies [Line Items]

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