Goodwill and Other Intangibles Goodwill and Intangible Asset Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Goodwill and Intangible Assets [Line Items]
Unamortizable Goodwill	$ 2,794us-gaap_Goodwill	$ 2,794us-gaap_Goodwill	$ 2,794us-gaap_Goodwill
Gross balance			61,305aoi_GoodwillAndIntangibleAssetsGross
Amortizable Intangibles, Accumulated amortization			(29,834)
Net balance	34,725aoi_GoodwillAndIntangibleAssetsNet	31,471aoi_GoodwillAndIntangibleAssetsNet
Additions	698	7,886
Amortizable Intangibles, Amortization expense	(3,532)us-gaap_AmortizationOfIntangibleAssets	(4,632)us-gaap_AmortizationOfIntangibleAssets	(5,370)us-gaap_AmortizationOfIntangibleAssets
Amortizable Intangibles, Net	29,097us-gaap_FiniteLivedIntangibleAssetsNet
Net balance	31,891aoi_GoodwillAndIntangibleAssetsNet	34,725aoi_GoodwillAndIntangibleAssetsNet	31,471aoi_GoodwillAndIntangibleAssetsNet
Other Regions [Member]
Goodwill and Intangible Assets [Line Items]
Unamortizable Goodwill	1,592	1,592	1,592
Value Added Services [Member]
Goodwill and Intangible Assets [Line Items]
Unamortizable Goodwill	1,202	1,202	1,202
Customer Relationships Intangible [Member]
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years as of March 31, 2015	10 years
Amortizable Intangibles, Gross carrying amount			33,700
Amortizable Intangibles, Accumulated amortization			(13,269)
Amortizable Intangibles, Net	18,746	20,431
Additions	0	0
Amortizable Intangibles, Amortization expense	(1,685)	(1,685)
Amortizable Intangibles, Net	17,061	18,746
Production and Supply Contract Intangibles [Member]
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years as of March 31, 2015	5 years 9 months
Amortizable Intangibles, Gross carrying amount			7,893
Amortizable Intangibles, Accumulated amortization			(3,657)
Amortizable Intangibles, Net	10,141	4,236
Additions	0	7,000
Amortizable Intangibles, Amortization expense	(1,034)	(1,095)
Amortizable Intangibles, Net	9,107	10,141
Internally Developed Software Intangible [Member]
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years as of March 31, 2015	0 years
Amortizable Intangibles, Gross carrying amount			16,918
Amortizable Intangibles, Accumulated amortization			(12,908)
Amortizable Intangibles, Net	3,044	4,010
Additions	698	886
Amortizable Intangibles, Amortization expense	(813)	(1,852)
Amortizable Intangibles, Net	$ 2,929	$ 3,044

Goodwill and Intangible Assets, Gross

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Goodwill and Intangible Assets

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No definition available.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

+ References

No definition available.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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