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Debt (Narratives) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Nov. 30, 2021
May 04, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2022
Debt Disclosure [Abstract]              
Long-term Debt     $ 750,000,000   $ 750,000,000    
Line of Credit Facility [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity     100,000,000   100,000,000    
Outstanding borrowings     482,560,000   482,560,000    
Current portion of long term debt and finance lease obligations     40,580,000   40,580,000   $ 40,551,000
Deferred Costs     6,323,000   6,323,000    
Accumulated Amortization, Deferred Finance Costs     1,356,000   1,356,000   898,000
Unsecured credit lines     $ 2,156,000   2,156,000    
Amount drawn on unsecured credit lines         0    
Stock Issued During Period, Shares, New Issues   4,312,500       4,312,500  
Common Stock, Par or Stated Value Per Share   $ 48.00          
Proceeds from Issuance or Sale of Equity         $ 0 $ 207,000,000  
Lessee, Finance Lease, Term of Contract     23 years   23 years    
Operating Income (Loss)     $ 27,372,000 $ 23,660,000 $ 50,191,000 34,406,000  
Long-term Debt     750,000,000   750,000,000    
Short-term Debt     40,000,000   40,000,000    
Debt Instrument, Periodic Payment, Principal     20,000,000        
Debt Instrument, Periodic Payment     2,630,000        
Bridge Loan     650,000,000   650,000,000    
Gain (Loss) on Extinguishment of Debt     0 0 0 14,803,000  
Dorner              
Line of Credit Facility [Line Items]              
Operating Income (Loss)       3,161,000   4,324,000  
Debt Issuance Costs, Gross       4,027,000   4,027,000  
Garvey              
Line of Credit Facility [Line Items]              
Debt Instrument, Increase (Decrease), Other, Net $ 75,000,000            
Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Accumulated Amortization, Deferred Finance Costs     1,208,000   1,208,000   $ 805,000
Extinguishment of Debt, Amount           326,000  
Revolving Credit Facility [Member] | Dorner              
Line of Credit Facility [Line Items]              
Debt Issuance Costs, Gross       977,000   977,000  
Required payments [Member]              
Line of Credit Facility [Line Items]              
Current portion of long term debt and finance lease obligations     5,260,000   5,260,000    
Secured Debt              
Line of Credit Facility [Line Items]              
Debt Issuance Costs, Gross       5,432,000   5,432,000  
Secured Debt | Loans [Member]              
Line of Credit Facility [Line Items]              
Debt Issuance Costs, Gross     892,000   892,000    
Bridge Loan              
Line of Credit Facility [Line Items]              
Extinguishment of Debt, Amount           8,531,000  
New Revolving Credit Facility              
Line of Credit Facility [Line Items]              
Outstanding letters of credit     16,047,000   16,047,000    
Deferred Costs, Noncurrent     4,027,000   4,027,000    
New Revolving Credit Facility | Dorner              
Line of Credit Facility [Line Items]              
Debt Issuance Costs, Gross       $ 3,050,000   3,050,000  
New Revolving Credit Facility | Standby Letters of Credit              
Line of Credit Facility [Line Items]              
Outstanding letters of credit     14,682,000   14,682,000    
New Revolving Credit Facility | Letter of Credit              
Line of Credit Facility [Line Items]              
Outstanding letters of credit     1,365,000   1,365,000    
New Revolving Credit Facility | Unsecured Lines of Credit              
Line of Credit Facility [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity     10,930,000   10,930,000    
Outstanding borrowings     $ 10,143,000   $ 10,143,000    
Long-Term Debt              
Line of Credit Facility [Line Items]              
Extinguishment of Debt, Amount           $ 5,946,000