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Long-Term Debt Senior Secured Second Lien Notes (Details) (USD $)
12 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Aug. 01, 2013
Debt Instrument [Line Items]        
Associated costs paid $ 0us-gaap_PaymentsOfDebtExtinguishmentCosts $ 36,033,000us-gaap_PaymentsOfDebtExtinguishmentCosts $ 0us-gaap_PaymentsOfDebtExtinguishmentCosts  
Senior Secured Second Lien Notes due 2021 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount       735,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= aoi_SeniorSecuredSecondLienNotesdueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Debt discount, percent       98.00%aoi_DebtDiscountPremiumPercent
/ us-gaap_DebtInstrumentAxis
= aoi_SeniorSecuredSecondLienNotesdueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Proceeds from Issuance of Senior Long-term Debt       720,300,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_DebtInstrumentAxis
= aoi_SeniorSecuredSecondLienNotesdueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Debt instrument, interest rate 9.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aoi_SeniorSecuredSecondLienNotesdueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
    9.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aoi_SeniorSecuredSecondLienNotesdueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Debt instrument, redemption percentage       101.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= aoi_SeniorSecuredSecondLienNotesdueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Repurchase of debt 15,000,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= aoi_SeniorSecuredSecondLienNotesdueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Senior notes 720,000,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= aoi_SeniorSecuredSecondLienNotesdueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Associated costs paid 38,000us-gaap_PaymentsOfDebtExtinguishmentCosts
/ us-gaap_DebtInstrumentAxis
= aoi_SeniorSecuredSecondLienNotesdueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Debt discount (1,323,000)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= aoi_SeniorSecuredSecondLienNotesdueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Repayment of long-term borrowings 13,715,000us-gaap_EarlyRepaymentOfSeniorDebt
/ us-gaap_DebtInstrumentAxis
= aoi_SeniorSecuredSecondLienNotesdueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Acceleration of deferred financing costs and amortization of debt discount $ 514,000aoi_AcceleratedRecognitionofDeferredFinancingCostsandDiscounts
/ us-gaap_DebtInstrumentAxis
= aoi_SeniorSecuredSecondLienNotesdueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Senior Secured Second Lien Notes due 2021 [Member] | Senior Notes [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Additional special interest annual rate interest, per year       1.00%aoi_DebtInstrumentAdditionalSpecialInterestAnnualRateIncreasePerYear
/ us-gaap_DebtInstrumentAxis
= aoi_SeniorSecuredSecondLienNotesdueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember