Information about Geographic Areas - Revenues by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 30, 2014	Apr. 30, 2013
Revenues by geography
Total revenues	$ 66,721	$ 42,788
North America [Member]
Revenues by geography
Total revenues	37,478	25,916
Europe [Member]
Revenues by geography
Total revenues	16,546	10,633
Asia Pacific [Member]
Revenues by geography
Total revenues	$ 12,697	$ 6,239

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration