Goodwill and Intangible Assets, net - Narrative (Details) - USD ($)	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Jan. 31, 2017
Goodwill [Line Items]
Goodwill	$ 6,282,000		$ 2,630,000
Goodwill impairments	0	$ 0
Amortization expense	700,000	300,000
Stormpath Inc.
Goodwill [Line Items]
Goodwill, acquired during period	3,700,000
Capitalized internal-use software costs
Goodwill [Line Items]
Stock-based compensation included in capitalized software costs	$ 200,000	$ 100,000