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Deferred Method of Accounting for Major Overhaul (Details) (Engine and transmission overhaul, USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Engine and transmission overhaul |  |  |
Capitalized and amortized: |  |  |
Property, plant and equipment, useful life | 3 years 0 months 0 days | 3 years 0 months 0 days | 3 years 0 months 0 days
Net amount of (gains) losses netted against depreciation expense | $ 22.5 | $ 20.9 | $ 23.1

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- Definition The net gain (loss) resulting from the sale, transfer, termination, or other disposition of assets during the period, excluding transactions involving capital leases, assets-held- or available-for-lease, and other real estate owned which, to the extent appropriate, are included in gains (losses) on the disposition of assets in nonoperating income (expense). + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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