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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
Amortized Cost and Fair Value Debt Securities [Abstract]
Less than one year	$ 9,470alot_AvailableForSaleSecuritiesEquityMaturitiesNextTwelveMonthsFairValue	$ 11,439alot_AvailableForSaleSecuritiesEquityMaturitiesNextTwelveMonthsFairValue
One to three years	5,704alot_AvailableForSaleSecuritiesEquityMaturitiesOneToThreeYearsFairValue	7,327alot_AvailableForSaleSecuritiesEquityMaturitiesOneToThreeYearsFairValue
Fair Value	$ 15,174us-gaap_AvailableForSaleSecuritiesEquitySecurities	$ 18,766us-gaap_AvailableForSaleSecuritiesEquitySecurities

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- Definition

Available for sale securities equity maturities next twelve months fair value.

+ References

No definition available.

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- Definition

Available for sale securities equity maturities one to three years fair value.

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No definition available.

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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

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