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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