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Debt (Narratives) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
May 18, 2023
Mar. 31, 2023
Line of Credit Facility [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity           $ 175,000,000  
Outstanding borrowings   $ 512,560,000   $ 512,560,000      
Current portion of long-term debt and finance lease obligations   50,636,000   50,636,000     $ 40,604,000
Deferred Costs   7,845,000   7,845,000     6,323,000
Accumulated Amortization, Deferred Finance Costs   2,356,000   2,356,000     1,815,000
Unsecured credit lines   $ 2,326,000   2,326,000      
Amount drawn on unsecured credit lines       0      
Proceeds from Issuance or Sale of Equity       $ (2,859,000) $ 0    
Lessee, Finance Lease, Term of Contract   23 years   23 years      
Operating Income (Loss)   $ 33,351,000 $ 27,372,000 $ 54,799,000 50,191,000    
Short-term Debt   50,000,000   50,000,000      
Debt Instrument, Periodic Payment, Principal   25,000,000          
Debt Instrument, Periodic Payment   3,058,000          
Debt Instrument, Increase (Decrease), Other, Net $ 75,000,000            
Amortization of Intangible Assets   7,508,000 $ 6,447,000 14,385,000 $ 12,982,000    
Accounts Receivable, after Allowance for Credit Loss, Current   166,390,000   166,390,000     151,451,000
Line of Credit Facility, Increase (Decrease), Net       75,000,000      
UNITED STATES              
Line of Credit Facility [Line Items]              
Accounts Receivable, after Allowance for Credit Loss, Current   80,078,000   80,078,000      
Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Accumulated Amortization, Deferred Finance Costs   2,116,000   2,116,000     1,611,000
Deferred Costs, Noncurrent   4,828,000   4,828,000     4,027,000
Required payments [Member]              
Line of Credit Facility [Line Items]              
Current portion of long-term debt and finance lease obligations   6,116,000   6,116,000      
Secured Debt | Asset-Backed Securities, Securitized Loans and Receivables              
Debt Disclosure [Abstract]              
Long-term Debt   45,000,000   45,000,000      
Line of Credit Facility [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity   55,000,000   55,000,000      
Accumulated Amortization, Deferred Finance Costs   60,000   60,000      
Long-term Debt   45,000,000   45,000,000      
Debt Issuance Costs, Gross   536,000   536,000      
Secured Debt | Loans [Member]              
Line of Credit Facility [Line Items]              
Debt Issuance Costs, Gross   2,414,000   2,414,000     $ 892,000
New Revolving Credit Facility              
Line of Credit Facility [Line Items]              
Outstanding letters of credit   15,719,000   15,719,000      
Increase in Deferred Costs, Noncurrent       801,000      
New Revolving Credit Facility | Standby Letters of Credit              
Line of Credit Facility [Line Items]              
Outstanding letters of credit   15,525,000   15,525,000      
New Revolving Credit Facility | Letter of Credit              
Line of Credit Facility [Line Items]              
Outstanding letters of credit   194,000   194,000      
New Revolving Credit Facility | Unsecured Lines of Credit              
Line of Credit Facility [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity   12,847,000   12,847,000      
Outstanding borrowings   $ 10,239,000   $ 10,239,000