Annual report pursuant to Section 13 and 15(d)

Pension and Other Post-retirement Benefit Plans - Summary of Changes in the Fair Value of the Defined Benefit Pension Plan (Details)

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Pension and Other Post-retirement Benefit Plans - Summary of Changes in the Fair Value of the Defined Benefit Pension Plan (Details) - Pension - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year $ 71,491 $ 10,004
Actual return on plan assets 1,165 2,594
Employer contributions 7,882 4,766
Benefits paid (1,096) (1,128)
Foreign currency exchange rate changes (3,161) 3,831
Fair value of plan assets at end of year 63,902 71,491
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 697 580
Actual return on plan assets 20 41
Employer contributions 233 219
Benefits paid (247) (233)
Foreign currency exchange rate changes (61) 90
Fair value of plan assets at end of year $ 642 $ 697