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)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Defined Benefit Plan Disclosure        
Defined Benefit Plan, Number of Plans     11  
Pension        
Defined Benefit Plan Disclosure        
Contribution by employer     $ 5,000  
Net periodic benefit (income) costs        
Net service cost $ 1,233 $ 1,316 2,466 $ 2,632
Interest cost 478 425 956 850
Expected return on net assets (531) (504) (1,062) (1,007)
Amortization:        
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 107 90 214 181
Prior service cost 23 20 46 40
Total net periodic benefit (income) costs 1,310 1,347 2,620 2,696
Pension | Maximum        
Defined Benefit Plan Disclosure        
Estimated employer contribution in current fiscal year 8,500   $ 8,500  
Pension | Europe        
Defined Benefit Plan Disclosure        
Defined Benefit Plan, Number of Plans     6  
Pension | Singapore        
Defined Benefit Plan Disclosure        
Defined Benefit Plan, Number of Plans     1  
Pension | Mexico        
Defined Benefit Plan Disclosure        
Defined Benefit Plan, Number of Plans     2  
Pension | JAPAN        
Defined Benefit Plan Disclosure        
Defined Benefit Plan, Number of Plans     2  
Other Benefits        
Net periodic benefit (income) costs        
Net service cost 0 0 $ 0 0
Interest cost 3 3 6 6
Expected return on net assets 0 0 0 0
Amortization:        
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (39) (47) (77) (94)
Prior service cost 0 0 0 0
Total net periodic benefit (income) costs $ (36) $ (44) $ (71) $ (88)