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Stock-Based Compensation Plans (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended 1 Months Ended
Oct. 31, 2014
Jul. 31, 2014
Oct. 31, 2012
Oct. 31, 2013
Jul. 31, 2013
Nov. 09, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation costs $ 276,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions $ 110,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions        
Total stock compensation expense recognized 29,000us-gaap_AllocatedShareBasedCompensationExpense 36,000us-gaap_AllocatedShareBasedCompensationExpense        
Minimum service period to participate in employee stock purchase plan 9 months          
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total stock compensation expense recognized 74,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
56,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
2000 Stock Option Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average exercise price, options, outstanding $ 1.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandStockOptionPlanMember
$ 1.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandStockOptionPlanMember
  $ 1.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandStockOptionPlanMember
$ 1.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandStockOptionPlanMember
 
Common stock authorized for issuance 1,950,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= aris_TwoThousandStockOptionPlanMember
         
Shareholder percent ownership of the company 10.00%aris_ShareholderPercentOwnershipOfCompany
/ us-gaap_PlanNameAxis
= aris_TwoThousandStockOptionPlanMember
         
Employee stock purchase plan shares reserved for issuance 575,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= aris_TwoThousandStockOptionPlanMember
         
Shares issued 224,955us-gaap_SharesIssued
/ us-gaap_PlanNameAxis
= aris_TwoThousandStockOptionPlanMember
200,311us-gaap_SharesIssued
/ us-gaap_PlanNameAxis
= aris_TwoThousandStockOptionPlanMember
       
Purchase price as percent of fair market value 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_PlanNameAxis
= aris_TwoThousandStockOptionPlanMember
         
Non-vested weighted average remaining vesting period 0 years 9 months        
Maximum number of shares per employee per year 5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
/ us-gaap_PlanNameAxis
= aris_TwoThousandStockOptionPlanMember
         
2000 Stock Option Plan [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average exercise price, options, outstanding $ 2.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandStockOptionPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
         
Stock option grants exercisable period 10 years          
2000 Stock Option Plan [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average exercise price, options, outstanding $ 0.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandStockOptionPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
Stock option grants exercisable period 5 years          
2010 Stock Option Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average exercise price, options, outstanding $ 2.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandTenStockOptionPlanMember
$ 2.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandTenStockOptionPlanMember
  $ 1.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandTenStockOptionPlanMember
$ 1.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandTenStockOptionPlanMember
 
Shares issued           1,850,000us-gaap_SharesIssued
/ us-gaap_PlanNameAxis
= aris_TwoThousandTenStockOptionPlanMember
Non-vested weighted average remaining vesting period 2 years 9 months 18 days 1 year 5 months 27 days        
2010 Stock Option Plan [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares issued           1,525,000us-gaap_SharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= aris_TwoThousandTenStockOptionPlanMember
2010 Stock Option Plan [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average exercise price, options, outstanding $ 3.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandTenStockOptionPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 2.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandTenStockOptionPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
2010 Stock Option Plan [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average exercise price, options, outstanding $ 0.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandTenStockOptionPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 0.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= aris_TwoThousandTenStockOptionPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Executive Bonus Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total stock compensation expense recognized 2,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= aris_ExecutiveBonusPlanMember
         
Shares vest 4,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_TitleOfIndividualAxis
= aris_ExecutiveBonusPlanMember
    13,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_TitleOfIndividualAxis
= aris_ExecutiveBonusPlanMember
   
Stock Issued During Period, Value, Restricted Stock Award, Gross     $ 22,000us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_TitleOfIndividualAxis
= aris_ExecutiveBonusPlanMember
     
Stock Issued During Period, Shares, Restricted Stock Award, Gross     18,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_TitleOfIndividualAxis
= aris_ExecutiveBonusPlanMember