Quarterly report pursuant to Section 13 or 15(d)

Defined Benefit Pension and Other Postretirement Benefit Plans (Details)

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Defined Benefit Pension and Other Postretirement Benefit Plans (Details) (USD $)
3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Defined benefit pension plans
   
Net periodic benefit costs    
Net service cost $ 414,000 $ 331,000
Interest cost 494,000 533,000
Expected return on net assets (172,000) (175,000)
Amortization:    
Actuarial (gain) loss 130,000 96,000
Prior service cost 6,000 6,000
Total net periodic benefit (income) costs 872,000 791,000
Estimated employer contribution in current fiscal year 2,400,000  
Contribution by employer 500,000  
Defined benefit pension plans | Europe
   
Amortization:    
Number of defined benefit pension plans 7  
Defined benefit pension plans | Singapore
   
Amortization:    
Number of defined benefit pension plans 1  
Defined benefit pension plans | Mexico
   
Amortization:    
Number of defined benefit pension plans 2  
Defined benefit postretirement pension plan
   
Net periodic benefit costs    
Interest cost 9,000 14,000
Amortization:    
Actuarial (gain) loss (72,000) (71,000)
Total net periodic benefit (income) costs $ (63,000) $ (57,000)