Pension and Other Benefit Plans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Target	100.00%
Actual	100.00%	100.00%
Pension Plans
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
2020	$ 27,018
2021	26,970
2022	27,268
2023	27,622
2024	27,568
2025-2029	$ 134,589
Pension Plans \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual	35.00%	46.00%
Pension Plans \| Fixed income
Defined Benefit Plan Disclosure [Line Items]
Actual	65.00%	54.00%
Postretirement Benefit Plans
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
2021	$ 302
2022	273
2023	252
2024	233
2025-2029	$ 829

Defined Benefit Plan, Expected Future Benefit Payments, Year One

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Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Section 50
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Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year.

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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