Summary Of Accounting Policies (Schedule Of Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2012 Y	Mar. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,581,139	$ 4,354,312
Accumulated depreciation and amortization	(2,496,991)	(2,270,281)
Property and equipment, net	2,084,148	2,084,031
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	126,314	134,187
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,027,050	1,019,970
Depreciable Life (In Years)	30
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	291,635	279,888
Depreciable Life (In Years), maximum	30
Furniture, Fixtures, Computer Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	374,472	372,282
Depreciable Life (In Years), minimum	3
Depreciable Life (In Years), maximum	7
Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,673,941	2,445,969
Depreciable Life (In Years), minimum	3
Depreciable Life (In Years), maximum	10
Construction-In-Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 87,727	$ 102,016

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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