Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
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| Statement Of Income And Comprehensive Income [Abstract] | ||
| Defined benefit pension and other postretirement plans, tax | $ 49 | $ 93 |
| X | ||||||||||
- Definition Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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