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Pension and Other Benefits (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Change in pension liability and postretirement obligations, net of tax |  | $ (41,685,000) | $ 23,896,000 | $ 5,166,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | $ 313,366,000 | 313,366,000 |  |
Fair value of plan assets at end of year |  | 286,678,000 | 313,366,000 |
Dorner |  |  |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Secured Long-term Debt, Noncurrent |  | 750,000,000 |  |
Dorner | Bridge Loan |  |  |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Secured Long-term Debt, Noncurrent |  | 650,000,000 |  |
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  | 5,215,000 |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  | 401,870,000 | 410,181,000 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets |  | 283,280,000 | 257,093,000 |
Assets for Plan Benefits, Defined Benefit Plan |  | 427,000 | 6,587,000 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment |  | 19,038,000 | 0 | 0
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | (24,492,000) | (26,852,000) |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Benefit obligation at beginning of year | 459,866,000 | 459,866,000 | 446,397,000 |
Service cost |  | 1,092,000 | 1,139,000 | 1,078,000
Interest cost |  | 11,527,000 | 14,759,000 | 15,526,000
Actuarial (gain) loss |  | 3,729,000 | 26,193,000 |
Benefits paid |  | (24,492,000) | (26,852,000) |
Foreign exchange rate changes |  | 6,618,000 | (1,770,000) |
Benefit obligation at end of year |  | 404,841,000 | 459,866,000 | 446,397,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 313,366,000 | 313,366,000 | 321,902,000 |
Actual gain (loss) on plan assets |  | 49,582,000 | 7,512,000 |
Employer contribution |  | 1,316,000 | 10,967,000 |
Foreign exchange rate changes |  | 405,000 | (163,000) |
Fair value of plan assets at end of year |  | 286,678,000 | 313,366,000 | 321,902,000
Funded status |  | (118,163,000) | (146,500,000) |
Unrecognized actuarial loss |  |  | (105,878,000) |
Net amount recognized |  | (66,623,000) | (40,622,000) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Accrued liabilities |  | (3,679,000) | (3,563,000) |
Other non-current liabilities |  | (114,911,000) | (149,524,000) |
Net amount recognized |  | (66,623,000) | (40,622,000) |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax |  | 51,540,000 | 105,878,000 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | 22,104,000 | 2,290,000 | 489,000
Federal tax credits (5) |  | (53,499,000) | 0 |
Defined Benefit Plan, Plan Assets, Payment for Settlement |  | 53,499,000 | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | 2,722,000 |  |  |
Postretirement Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | (232,000) | (192,000) |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Benefit obligation at beginning of year | 1,887,000 | 1,887,000 | 2,348,000 |
Interest cost |  | 46,000 | 71,000 | 92,000
Actuarial (gain) loss |  | 313,000 | 340,000 |
Benefit obligation at end of year |  | 1,388,000 | 1,887,000 | 2,348,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Funded status |  | (1,388,000) | (1,887,000) |
Net amount recognized |  | (2,855,000) | (3,304,000) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Accrued liabilities |  | (193,000) | (270,000) |
Other non-current liabilities |  | (1,195,000) | (1,617,000) |
Net amount recognized |  | (2,855,000) | (3,304,000) |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax |  | 1,467,000 | 1,417,000 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | (217,000) | (134,000) | $ (64,000)
Equity Securities [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 94,336,000 | 94,336,000 |  |
Fair value of plan assets at end of year |  | 116,468,000 | 94,336,000 |
Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 199,613,000 | 199,613,000 |  |
Fair value of plan assets at end of year |  | 155,553,000 | 199,613,000 |
Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 9,401,000 | 9,401,000 |  |
Fair value of plan assets at end of year |  | 12,863,000 | 9,401,000 |
Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 10,016,000 | 10,016,000 |  |
Fair value of plan assets at end of year |  | 1,794,000 | 10,016,000 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 91,320,000 | 91,320,000 |  |
Fair value of plan assets at end of year |  | 72,668,000 | 91,320,000 |
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 52,084,000 | 52,084,000 |  |
Fair value of plan assets at end of year |  | 63,758,000 | 52,084,000 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 24,014,000 | 24,014,000 |  |
Fair value of plan assets at end of year |  | 7,115,000 | 24,014,000 |
Fair Value, Inputs, Level 1 [Member] | Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 5,206,000 | 5,206,000 |  |
Fair value of plan assets at end of year |  | 1,000 | 5,206,000 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 10,016,000 | 10,016,000 |  |
Fair value of plan assets at end of year |  | 1,794,000 | 10,016,000 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 139,498,000 | 139,498,000 |  |
Fair value of plan assets at end of year |  | 122,071,000 | 139,498,000 |
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |  |
Fair value of plan assets at end of year |  | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 139,498,000 | 139,498,000 |  |
Fair value of plan assets at end of year |  | 122,071,000 | 139,498,000 |
Fair Value, Inputs, Level 2 [Member] | Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |  |
Fair value of plan assets at end of year |  | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |  |
Fair value of plan assets at end of year |  | 0 | 0 |
(Level 3) |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 5,503,000 | 5,503,000 |  |
Fair value of plan assets at end of year |  | 1,169,000 | 5,503,000 |
(Level 3) | Equity Securities [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |  |
Fair value of plan assets at end of year |  | 0 | 0 |
(Level 3) | Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 5,503,000 | 5,503,000 |  |
Fair value of plan assets at end of year |  | 1,169,000 | 5,503,000 |
(Level 3) | Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |  |
Fair value of plan assets at end of year |  | 0 | 0 |
(Level 3) | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |  |
Fair value of plan assets at end of year |  | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 77,045,000 | 77,045,000 |  |
Fair value of plan assets at end of year |  | 90,770,000 | 77,045,000 |
Fair Value Measured at Net Asset Value Per Share [Member] | Equity Securities [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 42,252,000 | 42,252,000 |  |
Fair value of plan assets at end of year |  | 52,710,000 | 42,252,000 |
Fair Value Measured at Net Asset Value Per Share [Member] | Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 30,598,000 | 30,598,000 |  |
Fair value of plan assets at end of year |  | 25,198,000 | 30,598,000 |
Fair Value Measured at Net Asset Value Per Share [Member] | Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 4,195,000 | 4,195,000 |  |
Fair value of plan assets at end of year |  | 12,862,000 | 4,195,000 |
Fair Value Measured at Net Asset Value Per Share [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | $ 0 | 0 |  |
Fair value of plan assets at end of year |  | $ 0 | $ 0 |

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