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Securities Available for Sale - Contractual Maturity Dates of Securities (Detail) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2015 | Jan. 31, 2014
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Amortized Cost and Fair Value Debt Securities [Abstract] |  |
Less than one year | $ 9,470 alot_AvailableForSaleSecuritiesEquityMaturitiesNextTwelveMonthsFairValue | $ 11,439 alot_AvailableForSaleSecuritiesEquityMaturitiesNextTwelveMonthsFairValue
One to three years | 5,704 alot_AvailableForSaleSecuritiesEquityMaturitiesOneToThreeYearsFairValue | 7,327 alot_AvailableForSaleSecuritiesEquityMaturitiesOneToThreeYearsFairValue
Fair Value | $ 15,174 us-gaap_AvailableForSaleSecuritiesEquitySecurities | $ 18,766 us-gaap_AvailableForSaleSecuritiesEquitySecurities

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- Definition Available for sale securities equity maturities next twelve months fair value. + References No definition available. + Details
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- Definition Available for sale securities equity maturities one to three years fair value. + References No definition available. + Details
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- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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