Quarterly report pursuant to Section 13 or 15(d)

Debt and Financing Arrangements - Narrative (Details)

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Debt and Financing Arrangements - Narrative (Details)
 3 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2024
EUR (€)
Sep. 30, 2024
USD ($)
Sep. 30, 2024
EUR (€)
Line of Credit Facility [Line Items]          
Accounts payable, trade $ 3,012,000     $ 3,014,000  
Other borrowings 809,211,000     776,467,000  
2027 Senior Secured Notes          
Line of Credit Facility [Line Items]          
Debt issuance costs, gross 5,201,000     5,249,000  
Other borrowings $ 294,799,000     294,751,000  
Other borrowings          
Line of Credit Facility [Line Items]          
Weighted-average interest rate on outstanding borrowings (as a percent) 2.33% 4.20% 2.33%    
Other borrowings $ 7,869,000     15,602,000  
Senior Notes 2027 | 2027 Senior Notes          
Line of Credit Facility [Line Items]          
Debt issued amount $ 300,000,000        
Fixed interest rate (as a percent) 8.625%   8.625%    
Receivables Purchase Agreement          
Line of Credit Facility [Line Items]          
Facility limit $ 125,000,000        
Receivables sold to purchasers 100,700,000     96,300,000  
Unsold receivables 66,272,000     58,183,000  
Principal amount of receivables sold 21,449,000 $ 17,118,000      
Factored accounts receivable, outstanding 17,126,000     15,665,000  
Revolving credit facilities | March 2020 Debt Amendment          
Line of Credit Facility [Line Items]          
Maximum amount of borrowings available 750,000,000        
Maximum borrowing amount drawn In foreign currency $ 350,000,000        
Rate spread adjustment (as a percent) 0.10%        
Interest rate during period (as a percent) 1.50%        
Unamortized debt costs $ 4,713,000     4,961,000  
Revolving credit facilities | March 2020 Debt Amendment | Minimum          
Line of Credit Facility [Line Items]          
Interest rate on borrowings (as a percent) 1.00%        
Line of credit facility, unused capacity, commitment fee percentage 0.15%        
Revolving credit facilities | March 2020 Debt Amendment | Maximum          
Line of Credit Facility [Line Items]          
Interest rate on borrowings (as a percent) 2.00%        
Line of credit facility, unused capacity, commitment fee percentage 0.30%        
Domestic Revolving Credit Facility | March 2020 Debt Amendment          
Line of Credit Facility [Line Items]          
Maximum available for issuance of trade and standby letters of credit $ 75,000,000        
Outstanding borrowings $ 480,969,000     410,527,000  
Weighted-average interest rate on outstanding borrowings (as a percent) 5.17% 5.32% 5.17%    
Foreign Line of Credit | Foreign currency debt instruments          
Line of Credit Facility [Line Items]          
Notional amount     € 0 $ 33,485,000 € 30,000,000.0
Foreign Line of Credit | Credit Facility With European Bank          
Line of Credit Facility [Line Items]          
Maximum amount of borrowings available $ 8,310,000   8,000,000.0    
Outstanding borrowings $ 3,114,000   € 3,000,000.0   € 0
Weighted-average interest rate on outstanding borrowings (as a percent) 5.10% 6.11% 5.10%    
Foreign Line of Credit | Bank Guarantees | Credit Facility With European Bank          
Line of Credit Facility [Line Items]          
Maximum amount of borrowings available $ 19,218,000   € 18,500,000