Other Comprehensive Loss - Components Reclassified from AOCI to Earnings (Details) - USD ($) $ in Thousands	3 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Pensions and other postretirement benefits
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive loss to net income, gross	$ 395	$ 366
Tax effects of amounts reclassified from accumulated other comprehensive loss to net income	(84)	0
Amounts reclassified from accumulated other comprehensive loss to net income, net	311	366
Actuarial loss
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive loss to net income, gross	560	533
Amortization of prior service cost
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive loss to net income, gross	(165)	(167)
Derivatives
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive loss to net income, gross	651	0
Tax effects of amounts reclassified from accumulated other comprehensive loss to net income	(137)	0
Amounts reclassified from accumulated other comprehensive loss to net income, net	$ 514	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss).

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