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Goodwill and Other Intangibles Estimated Intangible Asset Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
2016 $ 5,421us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
2017 3,830us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2018 3,600us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2019 3,341us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
2020 3,222us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Later 9,683us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Estimated intangible asset amortization expense 29,097us-gaap_FiniteLivedIntangibleAssetsNet    
Customer Relationships Intangible [Member]      
Finite-Lived Intangible Assets [Line Items]      
2016 1,685us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
2017 1,685us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
2018 1,685us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
2019 1,685us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
2020 1,685us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Later 8,636us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Estimated intangible asset amortization expense 17,061us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
18,746us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
20,431us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Production and Supply Contract Intangibles [Member]      
Finite-Lived Intangible Assets [Line Items]      
2016 2,459us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
   
2017 1,405us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
   
2018 1,403us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
   
2019 1,397us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
   
2020 1,396us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
   
Later 1,047us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
   
Estimated intangible asset amortization expense 9,107us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
10,141us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
4,236us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
Internally Developed Software Intangible [Member]      
Finite-Lived Intangible Assets [Line Items]      
2016 1,277us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= aoi_InternallyDevelopedSoftwareIntangibleAssetMember
   
2017 740us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= aoi_InternallyDevelopedSoftwareIntangibleAssetMember
   
2018 512us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= aoi_InternallyDevelopedSoftwareIntangibleAssetMember
   
2019 259us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= aoi_InternallyDevelopedSoftwareIntangibleAssetMember
   
2020 141us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= aoi_InternallyDevelopedSoftwareIntangibleAssetMember
   
Later 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= aoi_InternallyDevelopedSoftwareIntangibleAssetMember
   
Estimated intangible asset amortization expense $ 2,929us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= aoi_InternallyDevelopedSoftwareIntangibleAssetMember
$ 3,044us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= aoi_InternallyDevelopedSoftwareIntangibleAssetMember
$ 4,010us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= aoi_InternallyDevelopedSoftwareIntangibleAssetMember