Annual report pursuant to Section 13 and 15(d)

Pension and Other Post-retirement Benefit Plans (Details 4)

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Pension and Other Post-retirement Benefit Plans (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Deferred compensation plan for highly compensated employees      
Gains net of the employer matches related to the deferred compensation plan $ 141 $ 26 $ 6
Total benefits accrued 1,900 2,300  
Pension
     
Benefits and pension plans      
Fair value of plan assets 8,806 17,156  
Change in Fair value of plan assets      
Fair value of plan assets at beginning of year 17,156 15,919  
Actual return on plan assets 1,097 719  
Employer contributions 2,490 1,901  
Settlements (9,911)    
Employee contributions 73 84  
Benefits paid (1,300) (1,515)  
Foreign currency exchange rate change (799) 48  
Fair value of plan assets at end of year 8,806 17,156  
Pension | Fair Value
     
Benefits and pension plans      
Fair value of plan assets 8,806 17,156  
Change in Fair value of plan assets      
Fair value of plan assets at end of year 8,806 17,156  
Pension | Fair Value | International equities
     
Benefits and pension plans      
Fair value of plan assets 2,884 2,520  
Change in Fair value of plan assets      
Fair value of plan assets at end of year 2,884 2,520  
Pension | Fair Value | International bonds
     
Benefits and pension plans      
Fair value of plan assets 5,098 4,802  
Change in Fair value of plan assets      
Fair value of plan assets at end of year 5,098 4,802  
Pension | Fair Value | Insurance
     
Benefits and pension plans      
Fair value of plan assets 636 9,700  
Change in Fair value of plan assets      
Fair value of plan assets at end of year 636 9,700  
Pension | Fair Value | Other
     
Benefits and pension plans      
Fair value of plan assets 188 134  
Change in Fair value of plan assets      
Fair value of plan assets at end of year 188 134  
Pension | Level 1
     
Benefits and pension plans      
Fair value of plan assets 8,170 7,456  
Change in Fair value of plan assets      
Fair value of plan assets at end of year 8,170 7,456  
Pension | Level 1 | International equities
     
Benefits and pension plans      
Fair value of plan assets 2,884 2,520  
Change in Fair value of plan assets      
Fair value of plan assets at end of year 2,884 2,520  
Pension | Level 1 | International bonds
     
Benefits and pension plans      
Fair value of plan assets 5,098 4,802  
Change in Fair value of plan assets      
Fair value of plan assets at end of year 5,098 4,802  
Pension | Level 1 | Other
     
Benefits and pension plans      
Fair value of plan assets 188 134  
Change in Fair value of plan assets      
Fair value of plan assets at end of year 188 134  
Pension | Level 3
     
Benefits and pension plans      
Fair value of plan assets 636    
Change in Fair value of plan assets      
Fair value of plan assets at beginning of year 9,700    
Actual return on plan assets 132    
Employer contributions 848    
Settlements (9,255)    
Employee contributions 73    
Benefits paid (524)    
Foreign currency exchange rate change (338)    
Fair value of plan assets at end of year 636    
Pension | Level 3 | Insurance
     
Benefits and pension plans      
Fair value of plan assets 636 9,700  
Change in Fair value of plan assets      
Fair value of plan assets at end of year $ 636 $ 9,700