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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Property, Plant And Equipment (Schedule Of Cost And Accumulated Depreciation Of Property And Equipment) (Details) (USD $)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 136,859,000	$ 130,824,000
Less accumulated depreciation	(46,031,000)	(34,330,000)
Property, plant and equipment, net	90,828,000	96,494,000
Depreciation and amortization expense	12,900,000	8,400,000	7,100,000
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,022,000	4,022,000
Construction In Progress-Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	25,331,000	25,968,000
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	36,808,000	36,852,000
Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	62,785,000	57,151,000
Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,788,000	1,807,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,125,000	$ 5,024,000