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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
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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 | $ 1,900 us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | $ 2,120 us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember

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- Details
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Namespace Prefix: | alot_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant