Debt (Narratives) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	May 04, 2021
Line of Credit Facility [Line Items]
New Credit Agreement 2017	$ 545,000,000
Line of Credit Facility, Maximum Borrowing Capacity	100,000,000
Outstanding letters of credit	17,151,000
Payments of financing costs	0	$ 826,000	$ 0
Carrying amount of the Company's revolving credit facility	502,560,000	254,900,000
Long-term Debt, Current Maturities	40,551,000	4,450,000
Line of Credit Facility, Fair Value of Amount Outstanding	0
Gross balance of deferred costs	6,323,000
Accumulated amortization balances	898,000	8,744,000
Debt obligations	2,434,000
Amount drawn on unsecured credit lines	0
Debt Instrument, Unamortized Discount, Noncurrent	(5,425,000)	(5,946,000)
Long-term Debt	$ (497,135,000)	(248,954,000)
Long-term Debt, Term	7 years
2023	$ 5,260,000
Line of Credit, Current	100,000,000
Extinguishment of Debt, Amount	$ 14,803,000	0	0
Stock Issued During Period, Shares, New Issues	4,312,500
Common Stock, Par or Stated Value Per Share				$ 48.00
Proceeds from Issuance or Sale of Equity	$ 207,000,000	0	$ 0
Short-term Debt	40,000,000
Deferred Costs	14,690,000
Finance Lease, Liability, Undiscounted Excess Amount	$ 19,196,000
Lessee, Finance Lease, Term of Contract	23 years
Proceeds from Issuance of Common Stock	$ 207,000,000
Short-term Debt
Line of Credit Facility [Line Items]
Finance Lease, Liability, Undiscounted Excess Amount	544,000
Minimum
Line of Credit Facility [Line Items]
Outstanding letters of credit	849,000
Foreign Line of Credit
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	12,503,000
Outstanding borrowings	9,135,000
Long-term Debt
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent	450,000,000
Line of Credit
Line of Credit Facility [Line Items]
Gross balance of deferred costs	4,027,000	3,615,000
Extinguishment of Debt, Amount	326,000
Debt Issuance Costs, Gross	4,027,000
Bridge Loan
Line of Credit Facility [Line Items]
Extinguishment of Debt, Amount	8,531,000
Secured Debt
Line of Credit Facility [Line Items]
Extinguishment of Debt, Amount	5,946,000
Debt Issuance Costs, Gross	5,432,000
Secured Debt | Loans
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross	892,000
Standby Letters of Credit
Line of Credit Facility [Line Items]
Outstanding letters of credit	16,302,000
STAHL [Member]
Line of Credit Facility [Line Items]
Secured Debt, Current	5,260,000
STAHL [Member] | Line of Credit
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent	445,000,000
Debt Issuance Costs, Gross	977,000
STAHL [Member] | New Revolving Credit Facility
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent	100,000,000
Accumulated amortization balances	805,000	2,313,000
STAHL [Member] | Other Current Liabilities [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Periodic Payment, Principal	22,440,000	$ 4,450,000
Dorner
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent	750,000,000
Dorner | Line of Credit
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent	100,000,000
Debt Issuance Costs, Gross	3,050,000
Dorner | Bridge Loan
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent	$ 650,000,000