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Retirement Plans - Net Periodic Pension Costs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment $ (45) $ (46) $ (42)
United States Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 371
Interest cost 631 658 664
Expected return on plan assets (514) (496) (816)
Amortization and deferral 184 303 453
Net periodic benefit cost 301 465 672
International Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 997 1,025 871
Interest cost 1,831 1,795 1,848
Expected return on plan assets (2,151) (2,264) (1,875)
Amortization and deferral 1,520 1,468 978
Net periodic benefit cost $ 2,197 $ 2,024 $ 1,822