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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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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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