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Income Taxes Accounting for Uncertainty in Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at $ 10,152us-gaap_UnrecognizedTaxBenefits $ 7,874us-gaap_UnrecognizedTaxBenefits $ 11,804us-gaap_UnrecognizedTaxBenefits
Increase for current year tax positions 6,959us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 2,512us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 1,661us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Reduction for prior year tax positions (161)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (111)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (1,960)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Impact of changes in exchange rates (749)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation (123)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation (131)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation
Reduction for settlements 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (3,500)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Balance at 16,201us-gaap_UnrecognizedTaxBenefits 10,152us-gaap_UnrecognizedTaxBenefits 7,874us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits, income tax penalties and interest accrued (98)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense (233)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Unrecognized tax benefits, interest on income taxes accrued 797us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 771us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued  
Unrecognized tax benefits, income tax penalties accrued 901us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued 1,025us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued  
Unrecognized tax benefits, income tax penalties and interest expense, related to settlements 22aoi_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpenseRelatedToSettlements    
Unrecognized tax benefits including interest and taxes 17,899aoi_UnrecognizedTaxBenefitsIncludingInterestAndTaxes 11,948aoi_UnrecognizedTaxBenefitsIncludingInterestAndTaxes  
Unrecognized tax benefits, reductions resulting from lapse of applicable statute of limitations 185us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations    
Decrease for current year tax positions 824aoi_UnrecognizedTaxBenefitIncreaseDecreaseFromCurrentYearResults    
Unrecognized tax benefit, increase related to adoption of new positions 6,959aoi_UnrecognizedTaxBenefitAggregateIncreaserelatedtoAdoptionofNewPositions    
Unrecognized tax benefits may decrease in the next twelve months $ 867us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound    
State Jurisdiction [Member] | Minimum [Member]      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Income tax examination, open tax years 3 years    
State Jurisdiction [Member] | Maximum [Member]      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Income tax examination, open tax years 6 years    
Non-U.S [Member] | Minimum [Member]      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Income tax examination, open tax years 3 years    
Non-U.S [Member] | Maximum [Member]      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Income tax examination, open tax years 6 years