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Property, Plant, And Equipment (Tables)
Mar. 31, 2012
Property, Plant And Equipment [Abstract]  
Significant Unobservable Inputs in Asset Valuation

 

Significant Unobservable Inputs

 

Range

Weighted Average

Weighted average cost of capital

7.5%-8.0%

7.8%

Long-term pre-tax operating margin (cash basis)

6.1%-7.8%

7.2%