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Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012
Loss Contingencies [Line Items]
Potential outcome minimum	$ 1.5
Potential outcome maximum	3.5
Defense Contract Management Agency [Member]
Loss Contingencies [Line Items]
Potential outcome minimum	0
Potential outcome maximum	$ 2.9

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.