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Fair Value Measurements - Fair Value Measurements of Assets on Non-Recurring Basis (Detail) (Fair Value, Measurements, Nonrecurring [Member], Level 2 [Member], USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Asset Held for Sale	$ 1,900us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	$ 2,120us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember

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- Details

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- Definition

Fair value portion of assets classified as held for sale.

+ 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=36462937&loc=d3e19190-110258

+ Details

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