Goodwill and Intangible Assets - Additional Information (Details) - Talkatone, Inc. $ in Millions	12 Months Ended
Jan. 31, 2015 USD ($)
Finite Lived Intangible Assets [Line Items]
Intangible assets recognized from acquisition	$ 1.5
Goodwill recognized from acquisition	$ 1.1

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Name:	us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration