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Commitments Contingencies and Litigation (Additional Information) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Jun. 30, 2013
lb
Mar. 31, 2013
lb
Foreign currency forward contracts
   
Commitments, Contingencies And Litigation [Line Items]    
Purchase price of hedges $ 81,949 $ 73,115
Interest rate swap agreements
   
Commitments, Contingencies And Litigation [Line Items]    
Convertible interest rate swap 65,000 85,000
Interest rate swap agreements | Minimum
   
Commitments, Contingencies And Litigation [Line Items]    
Interest rate swap agreements expiration date Feb. 01, 2013  
Interest rate swap agreements | Maximum
   
Commitments, Contingencies And Litigation [Line Items]    
Interest rate swap agreements expiration date May 01, 2013  
Lead hedge forward contracts
   
Commitments, Contingencies And Litigation [Line Items]    
Purchase price of hedges, pounds of lead 90,900,000 56,300,000
Purchase price of hedges $ 83,996 $ 56,601