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Stock-Based Compensation Cash-Settled Performance-Based Restricted Stock Units (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Unearned compensation $ 1,871,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Compensation expense 3,194,000us-gaap_AllocatedShareBasedCompensationExpense 3,222,000us-gaap_AllocatedShareBasedCompensationExpense 4,520,000us-gaap_AllocatedShareBasedCompensationExpense
Cash-Settled Performance-Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares expected to vest (in shares) 124aoi_SharebasedCompensationArrangementbySharebasedPaymentAwardExpectedtoVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Balance at (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
   
Granted (in shares) 458us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
   
Forfeited (in shares) (16)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
   
Balance at (in shares) 442us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Balance at, Weighted Average Grant Date Fair Value (usd per share) $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
   
Granted, Weighted Average Grant Date Fair Value (usd per share) $ 2.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
   
Forfeited, Weighted Average Grant Date Fair Value (usd per share) $ 2.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
   
Balance at, Weighted Average Grant Date Fair Value (usd per share) $ 2.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
 
Unearned compensation   98,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
 
Compensation expense $ 39,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
$ 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
$ 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
Period One [Member] | Cash-Settled Performance-Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 2 years    
Period Two [Member] | Cash-Settled Performance-Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 3 years    
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 2 years    
Minimum [Member] | Cash-Settled Performance-Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of plan's target contingent on performance level attained 0.00%aoi_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsPlanTargetContingent
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 3 years    
Maximum [Member] | Cash-Settled Performance-Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of plan's target contingent on performance level attained 200.00%aoi_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsPlanTargetContingent
/ us-gaap_AwardTypeAxis
= aoi_CashSettledPerformanceBasedRestrictedStockUnitsMemberMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember