Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 4,747	$ 4,939	$ 4,627
Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Prior service credits to be amortized from AOCI next year	706
Actuarial net gains (losses) to be amortized from AOCI next year	(376)
Expected employer contributions in next fiscal year	488
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Amount to be amortized from AOCI next year	(1,251)
Expected employer contributions in next fiscal year	3,991
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Amount to be amortized from AOCI next year	(873)
Expected employer contributions in next fiscal year	$ 1,827