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Property, Plant and Equipment (Details) (USD $)
3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment costs $ 1,917,502,000   $ 1,897,685,000
Accumulated depreciation 1,403,779,000   1,383,141,000
Property, plant and equipment, net 513,723,000   514,544,000
Depreciation expense 21,400,000 20,700,000  
Land [Member]
     
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment costs 54,247,000   47,102,000
Buildings and building improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment costs 393,933,000   396,611,000
Machinery and equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment costs 1,394,127,000   1,377,814,000
Projects in progress [Member]
     
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment costs $ 75,195,000   $ 76,158,000