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Fair Value (Detail) - Assets measured at fair value on a non-recurring basis (Assets Measured At Fair Value On A Non Recurring Basis Subsequent [Member], USD $) In Thousands, unless otherwise specified	Jan. 31, 2013
Property and equipment, net	$ 419	[1]
Fair Value, Inputs, Level 3 [Member]
Property and equipment, net	$ 2,096
[1] Total losses include impairment charges and loss on disposal.

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- Definition

Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant