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v3.22.1

Pension and Other Benefits (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Change in pension liability and postretirement obligations, net of tax |  | $ (16,312,000) | $ (41,685,000) | $ 23,896,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year |  | 286,678,000 |  |
Fair value of plan assets at end of year |  | $ 271,985,000 | $ 286,678,000 |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Actual |  | 100.00% | 100.00% |
Liabilities |  | $ 912,904,000 | $ 620,283,000 |
Liability, Defined Benefit Pension Plan, Noncurrent |  | 86,674,000 | 114,911,000 |
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 |  | 5,077,000 |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  | 211,307,000 | 401,870,000 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets |  | 121,110,000 | 283,280,000 |
Assets for Plan Benefits, Defined Benefit Plan |  | 5,208,000 | 427,000 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment |  | 0 | 19,038,000 | 0
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | (23,200,000) | (24,492,000) |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Benefit obligation at beginning of year | $ 459,866,000 | 404,841,000 | 459,866,000 |
Service cost |  | 980,000 | 1,092,000 | 1,139,000
Interest cost |  | 10,130,000 | 11,527,000 | 14,759,000
Actuarial (gain) loss |  | (30,482,000) | 3,729,000 |
Benefits paid |  | (23,200,000) | (24,492,000) |
Foreign exchange rate changes |  | (5,295,000) | 6,618,000 |
Benefit obligation at end of year |  | 356,974,000 | 404,841,000 | 459,866,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 313,366,000 | 286,678,000 | 313,366,000 |
Actual gain (loss) on plan assets |  | 3,048,000 | 49,582,000 |
Employer contribution |  | 5,442,000 | 1,316,000 |
Foreign exchange rate changes |  | 17,000 | 405,000 |
Fair value of plan assets at end of year |  | 271,985,000 | 286,678,000 | 313,366,000
Funded status |  | (84,989,000) | (118,163,000) |
Unrecognized actuarial loss |  |  | (51,540,000) |
Net amount recognized |  | (55,759,000) | (66,623,000) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Accrued liabilities |  | (3,523,000) | (3,679,000) |
Other non-current liabilities |  | (86,674,000) | (114,911,000) |
Net amount recognized |  | (55,759,000) | (66,623,000) |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax |  | 29,230,000 | 51,540,000 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | (470,000) | 22,104,000 | $ 2,290,000
Federal tax credits (3) |  | 0 | (53,499,000) |
Defined Benefit Plan, Plan Assets, Payment for Settlement |  | 0 | 53,499,000 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | $ 2,722,000 |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Increase (Decrease) for Plan Amendment |  |  | 19,038,000 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan |  | $ 2,176,000 | $ 3,910,000 |
Pension Plans | Fixed income securities |  |  |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Actual |  | 66.00% | 55.00% |
Pension Plans | Equity securities |  |  |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Actual |  | 34.00% | 45.00% |
Postretirement Benefit Plans |  |  |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Accrued liabilities |  | $ (183,000) |  |
Other non-current liabilities |  | (1,013,000) |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | 187,000 |  |
Liability, Defined Benefit Plan |  | 1,196,000 |  |
Defined Benefit Postretirement Life Insurance |  |  |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | 132,000 |  |
Liabilities |  | 4,645,000 |  |
MRB Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets |  | $ 146,592,000 |  |
MRB Pension Plan | Fixed income securities |  |  |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Actual |  | 81.00% |  |
MRB Pension Plan | Equity securities |  |  |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Actual |  | 19.00% |  |
Equity securities |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year |  | $ 116,468,000 |  |
Fair value of plan assets at end of year |  | 80,020,000 | $ 116,468,000 |
Fixed income securities |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year |  | 155,553,000 |  |
Fair value of plan assets at end of year |  | 178,155,000 | 155,553,000 |
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 |  | 12,863,000 |  |
Fair value of plan assets at end of year |  | 11,849,000 | 12,863,000 |
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 |  | 1,794,000 |  |
Fair value of plan assets at end of year |  | 1,961,000 | 1,794,000 |
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 |  | 72,668,000 |  |
Fair value of plan assets at end of year |  | 65,673,000 | 72,668,000 |
Fair Value, Inputs, Level 1 [Member] | Equity securities |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year |  | 63,758,000 |  |
Fair value of plan assets at end of year |  | 46,699,000 | 63,758,000 |
Fair Value, Inputs, Level 1 [Member] | Fixed income securities |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year |  | 7,115,000 |  |
Fair value of plan assets at end of year |  | 17,013,000 | 7,115,000 |
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 |  | 1,000 |  |
Fair value of plan assets at end of year |  | 0 | 1,000 |
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 |  | 1,794,000 |  |
Fair value of plan assets at end of year |  | 1,961,000 | 1,794,000 |
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 |  | 122,071,000 |  |
Fair value of plan assets at end of year |  | 133,670,000 | 122,071,000 |
Fair Value, Inputs, Level 2 [Member] | Equity securities |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year |  | 0 |  |
Fair value of plan assets at end of year |  | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Fixed income securities |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year |  | 122,071,000 |  |
Fair value of plan assets at end of year |  | 133,670,000 | 122,071,000 |
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 |  |
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 |  |
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 |  | 1,169,000 |  |
Fair value of plan assets at end of year |  | 1,160,000 | 1,169,000 |
(Level 3) | Equity securities |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year |  | 0 |  |
Fair value of plan assets at end of year |  | 0 | 0 |
(Level 3) | Fixed income securities |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year |  | 1,169,000 |  |
Fair value of plan assets at end of year |  | 1,160,000 | 1,169,000 |
(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 |  |
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 |  |
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 |  | 90,770,000 |  |
Fair value of plan assets at end of year |  | 71,482,000 | 90,770,000 |
Fair Value Measured at Net Asset Value Per Share [Member] | Equity securities |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year |  | 52,710,000 |  |
Fair value of plan assets at end of year |  | 33,321,000 | 52,710,000 |
Fair Value Measured at Net Asset Value Per Share [Member] | Fixed income securities |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year |  | 25,198,000 |  |
Fair value of plan assets at end of year |  | 26,312,000 | 25,198,000 |
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 |  | 12,862,000 |  |
Fair value of plan assets at end of year |  | 11,849,000 | 12,862,000 |
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 |  |
Fair value of plan assets at end of year |  | $ 0 | $ 0 |

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