Line of Credit - Additional Information (Detail) (USD $)	12 Months Ended
Jan. 31, 2014	Jan. 31, 2014 Revolving Credit Facility [Member]	Jan. 15, 2014 Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving line of credit		$ 5,000,000	$ 10,000,000
Line of credit basis spread on base rate	0.75%
Line of credit basis spread on London interbank offered rate	1.50%

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant