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Fair Value (Detail) - Assets measured at fair value on a non-recurring basis (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012
Assets Measured At Fair Value On A Non-recurring Basis Subsequent [Member] | Fair Value, Inputs, Level 3 [Member]
Property and equipment, net	$ 600
Assets Measured At Fair Value On A Non-recurring Basis Subsequent [Member]
Property and equipment, net	143
Fair Value, Inputs, Level 3 [Member] | Assets Measured At Fair Value On A Non-recurring Basis Over Various Dates [Member]
Property and equipment, net	8,803
Assets Measured At Fair Value On A Non-recurring Basis Over Various Dates [Member]
Property and equipment, net	$ 1,227

X

- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software, net of accumulated depreciation.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 33

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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