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Share-Based Compensation - Aggregated Information Regarding Stock Options Granted (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Beginning balance, Number of Shares | 736,647 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options Granted, Number of Shares | 158,600 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Options Exercised, Number of Shares | (224,275)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Options Expired, Number of Shares | (14,961)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Ending balance, Number of Shares | 656,011 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options Exercisable, Number of Shares | 413,612 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Beginning balance, Weighted Average Option Price Per Share | $ 8.63 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options Granted, Weighted Average Option Price Per Share | $ 13.99 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Options Exercised, Weighted Average Option Price Per Share | $ 8.29 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Options Expired, Weighted Average Option Price Per Share | $ 9.49 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice
Ending balance, Weighted Average Option Price Per Share | $ 10.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options Exercisable, Weighted Average Option Price Per Share | $ 8.78 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Range One [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Outstanding, Option Price Per Share, Lower range, Ending balance | $ 5.78 alot_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = alot_RangeOneMember
Options Outstanding, Option Price Per Share, Upper range, Ending balance | $ 11.9 alot_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = alot_RangeOneMember
Range Two [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Option Price Per Share, Lower range | $ 13.46 alot_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = alot_RangeTwoMember
Options Granted, Option Price Per Share, Upper range | $ 14.2 alot_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = alot_RangeTwoMember
Range Three [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Exercised, Option Price Per Share, Lower range | $ 6.22 alot_StockIssuedDuringPeriodSharesStockOptionsExercisedExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = alot_RangeThreeMember
Options Exercised, Option Price Per Share, Upper range | $ 11.9 alot_StockIssuedDuringPeriodSharesStockOptionsExercisedExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = alot_RangeThreeMember
Range Four [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Expired, Option Price Per Share, Lower range | $ 7.95 alot_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = alot_RangeFourMember
Options Expired, Option Price Per Share, Upper range | $ 14.2 alot_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = alot_RangeFourMember
Range Five [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Outstanding, Option Price Per Share, Lower range, Ending balance | $ 5.78 alot_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = alot_RangeFiveMember
Options Outstanding, Option Price Per Share, Upper range, Ending balance | $ 14.2 alot_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = alot_RangeFiveMember
Range Six [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Exercisable, Option Price Per Share, Lower range | $ 5.78 alot_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = alot_RangeSixMember
Options Exercisable, Option Price Per Share, Upper range | $ 13.46 alot_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = alot_RangeSixMember

X
- Definition Share based compensation arrangement by share based payment award options exercisable exercise price range lower range limit. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award options exercisable exercise price range upper range limit. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award options forfeitures and expirations in period exercise price range lower range limit. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award options forfeitures and expirations in period exercise price range upper range limit. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award options outstanding exercise price range lower range limit. + References No definition available. + Details
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- Definition Stock issued during period shares stock options exercised exercise price range lower range limit. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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