Retirement Plans - Net Periodic Pension Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	$ (43)	$ (45)	$ (46)
United States Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	616	631	658
Expected return on plan assets	(448)	(514)	(496)
Amortization and deferral	188	184	303
Net periodic benefit cost	356	301	465
International Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	906	997	1,025
Interest cost	1,485	1,831	1,795
Expected return on plan assets	(2,136)	(2,151)	(2,264)
Amortization and deferral	910	1,520	1,468
Net periodic benefit cost	$ 1,165	$ 2,197	$ 2,024