Pensions and Other Benefits (Details) - USD ($)	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	$ 231,667,000	$ 271,985,000
(Level 1)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	36,988,000	65,673,000
(Level 2)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	145,904,000	133,670,000
(Level 3)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	0	1,160,000
Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	48,775,000	71,482,000
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	41,850,000	80,020,000
Equity securities | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	27,576,000	46,699,000
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:	14,274,000	33,321,000
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	178,904,000	178,155,000
Fixed income securities | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	7,064,000	17,013,000
Fixed income securities | (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	145,904,000	133,670,000
Fixed income securities | (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	0	1,160,000
Fixed income securities | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	25,936,000	26,312,000
Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	8,565,000	11,849,000
Real Estate Funds [Member] | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	0	0
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:	8,565,000	11,849,000
Cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	2,348,000	1,961,000
Cash equivalents | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	2,348,000	1,961,000
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