Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	1 Months Ended	12 Months Ended
	Nov. 30, 2013	Jan. 31, 2016 USD ($) Customer	Jan. 31, 2015 USD ($) Customer	Jan. 31, 2014 USD ($) Customer
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Stock split ratio	2
Net foreign currency transaction losses		$ (2,300,000)	$ (648,000)	$ (16,000)
Restricted cash		7,100,000	4,600,000
Acquisition of intangible assets		0	9,125,000	0
Impairment charges		0	0	0
Deferred commissions, current		15,703,000	9,431,000
Deferred income taxes, non-current		14,300,000	7,500,000
Sales commission expenses		$ 47,200,000	27,700,000	11,000,000
Period required with included controller refresh to have additional maintenance and support renewal		3 years
Additional maintenance and support period		3 years
Warranty reserve		$ 0
Capitalization of software development cost		0	0	0
Advertising expenses		6,200,000	1,400,000	195,000
Other comprehensive income (loss)		$ 0	0	0
New Accounting Pronouncement Early Adoption Effect
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Decrease in non-current deferred tax assets			(5,500,000)	(2,500,000)
Decrease in current deferred tax liability			(5,800,000)	(2,600,000)
Increase in non-current deferred tax liability			300,000	$ 92,000
Hardware
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Standard product warranty period		3 years
Embedded Software
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Standard product warranty period		90 days
Technology Patents
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Acquisition of intangible assets			$ 9,100,000
Estimated useful life of intangible assets			7 years
Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contractual term		1 year
Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contractual term		3 years
Test Equipment
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life		2 years
Computer, Equipment and Software | Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life		2 years
Computer, Equipment and Software | Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life		3 years
Furniture and Fixtures
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life		7 years
Leasehold Improvements
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life		shorter of their estimated useful lives or the remaining lease term
Accounts Receivable
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of major channel partner or customer | Customer		2	1
Accounts Receivable | Customer Concentration Risk
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage		11.00%	13.00%
Sales Revenue Net
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of major channel partner or customer | Customer		0	0	0