Pension and Other Postretirement Benefits - Contributions to Plans (Details) - USD ($) $ in Thousands	3 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Retirement Benefits [Abstract]
Contributions made during the period	$ 875	$ 1,565
Contributions expected for the remainder of the fiscal year	6,306	5,557
Total	$ 7,181	$ 7,122

Defined Benefit Plan, Plan Assets, Contributions Expected for Remainder of Fiscal Year

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration