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Share-Based Compensation - Summarized Plan Activity (Detail)
12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Equity [Abstract]    
Shares Reserved, Beginning Balance 60,242alot_SharesReservedUnderEmployeeStockPurchasePlan 64,231alot_SharesReservedUnderEmployeeStockPurchasePlan
Shares Purchased (3,237)us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans (3,989)us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Shares Reserved, Ending Balance 57,005alot_SharesReservedUnderEmployeeStockPurchasePlan 60,242alot_SharesReservedUnderEmployeeStockPurchasePlan