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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