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v3.21.1

Pensions and Other Benefits (Details) - USD ($) | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | $ 286,678,000 | $ 313,366,000
(Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 72,668,000 | 91,320,000
(Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 122,071,000 | 139,498,000
(Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 1,169,000 | 5,503,000
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 90,770,000 | 77,045,000
Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 116,468,000 | 94,336,000
Equity securities | (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 63,758,000 | 52,084,000
Equity securities | (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 0 | 0
Equity securities | (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 0 | 0
Equity securities | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 52,710,000 | 42,252,000
Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 155,553,000 | 199,613,000
Fixed income securities | (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 7,115,000 | 24,014,000
Fixed income securities | (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 122,071,000 | 139,498,000
Fixed income securities | (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 1,169,000 | 5,503,000
Fixed income securities | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 25,198,000 | 30,598,000
Real Estate Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 12,863,000 | 9,401,000
Real Estate Funds [Member] | (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 1,000 | 5,206,000
Real Estate Funds [Member] | (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 0 | 0
Real Estate Funds [Member] | (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 0 | 0
Real Estate Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 12,862,000 | 4,195,000
Cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 1,794,000 | 10,016,000
Cash equivalents | (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 1,794,000 | 10,016,000
Cash equivalents | (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 0 | 0
Cash equivalents | (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | 0 | 0
Cash equivalents | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset categories: | $ 0 | $ 0

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