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Savings and Retirement Plans (Tables)
 6 Months Ended
Sep. 30, 2015
Savings and Retirement Plans [Abstract]  
Components of Benefit Costs for Defined Benefit Retirement Plans
The cost for our defined benefit retirement plans in The Netherlands and the United Kingdom includes the following components for the three- and six-month periods ended September 30:

  
Three Months Ended
September 30
  
Six Months Ended
September 30
 
  
2015
  
2014
  
2015
  
2014
 
         
Gross service cost
 
$
36,000
  
$
36,000
  
$
72,000
  
$
71,000
 
Interest cost
  
24,000
   
35,000
   
48,000
   
73,000
 
Expected return on assets
  
(19,000
)
  
(27,000
)
  
(38,000
)
  
(54,000
)
Amortization
  
7,000
   
1,000
   
14,000
   
2,000
 
Net periodic retirement cost
 
$
48,000
  
$
45,000
  
$
96,000
  
$
92,000