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 |