Pensions and Other Benefits (Details) - USD ($)	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	$ 271,985,000	$ 286,678,000
(Level 1)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	65,673,000	72,668,000
(Level 2)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	133,670,000	122,071,000
(Level 3)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	1,160,000	1,169,000
Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	71,482,000	90,770,000
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	80,020,000	116,468,000
Equity securities | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	46,699,000	63,758,000
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:	33,321,000	52,710,000
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	178,155,000	155,553,000
Fixed income securities | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	17,013,000	7,115,000
Fixed income securities | (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	133,670,000	122,071,000
Fixed income securities | (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	1,160,000	1,169,000
Fixed income securities | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	26,312,000	25,198,000
Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	11,849,000	12,863,000
Real Estate Funds [Member] | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	0	1,000
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:	11,849,000	12,862,000
Cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	1,961,000	1,794,000
Cash equivalents | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Asset categories:	1,961,000	1,794,000
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