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Indebtedness (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Mar. 31, 2012
Debt Instrument [Line Items] |  |
Short-term debt | $ 19,750 | $ 21,296
Long-term debt, fair value | 142,000 | 139,000
Line of Credit Facility [Line Items] |  |
Available for future borrowings | 187,000 |
Domestic Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Amount outstanding | 6,000 | 9,000
Maximum borrowing capacity | 145,000 |
Expiration date | Aug. 31, 2014 |
Available for future borrowings | 133,000 |
Foreign Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Available for future borrowings | 54,000 |
6.83% Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 125,000 |
Stated interest rate (in hundredths) | 6.83% |
Maturity date | Aug. 12, 2020 |

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