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)
 6 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2024
EUR (€)
Sep. 30, 2023
USD ($)
Sep. 30, 2023
EUR (€)
Line of Credit Facility [Line Items]          
Other borrowings $ 842,776,000     $ 790,180,000  
2025 Senior Notes          
Line of Credit Facility [Line Items]          
Unamortized debt costs 855,000     1,125,000  
Other borrowings $ 298,362,000     298,500,000  
Other borrowings          
Line of Credit Facility [Line Items]          
Weighted-average interest rate on outstanding borrowings (as a percent) 2.55% 3.01% 2.55%    
Other borrowings $ 17,200,000     19,241,000  
Senior Notes 2025 | 2025 Senior Notes          
Line of Credit Facility [Line Items]          
Debt issued amount $ 299,217,000        
Fixed interest rate (as a percent) 5.25%   5.25%    
Receivables Purchase Agreement          
Line of Credit Facility [Line Items]          
Facility limit $ 125,000,000        
Receivables sold to purchasers 109,900,000     101,800,000  
Unsold receivables 51,819,000     57,897,000  
Principal amount of receivables sold 34,993,000 $ 16,950,000      
Factored accounts receivable, outstanding 15,411,000     18,045,000  
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        
Debt issuance costs, gross 4,704,000        
Unamortized debt costs $ 5,363,000     949,000  
Revolving credit facilities | March 2020 Debt Amendment | Minimum          
Line of Credit Facility [Line Items]          
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]          
Line of credit facility, unused capacity, commitment fee percentage 0.30%        
Revolving credit facilities | March 2020 Debt Amendment | SOFR          
Line of Credit Facility [Line Items]          
Rate spread adjustment (as a percent) 0.10%        
Interest rate during period (as a percent) 1.50%        
Revolving credit facilities | March 2020 Debt Amendment | SOFR | Minimum          
Line of Credit Facility [Line Items]          
Interest rate on borrowings (as a percent) 1.00%        
Revolving credit facilities | March 2020 Debt Amendment | SOFR | Maximum          
Line of Credit Facility [Line Items]          
Interest rate on borrowings (as a percent) 2.00%        
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 $ 55,000,000        
Weighted-average interest rate on outstanding borrowings (as a percent) 4.89% 5.17% 4.89%    
Domestic Revolving Credit Facility | March 2020 Debt Amendment | United States of America, Dollars          
Line of Credit Facility [Line Items]          
Outstanding borrowings $ 447,949,000     405,000,000  
Foreign Line of Credit          
Line of Credit Facility [Line Items]          
Outstanding borrowings 59,370,000   € 55,000,000 $ 58,168,000 € 55,000,000
Foreign Line of Credit | Credit Facility With European Bank          
Line of Credit Facility [Line Items]          
Maximum amount of borrowings available 10,795,000   10,000,000    
Outstanding borrowings $ 3,738,000   € 3,500,000   € 0
Weighted-average interest rate on outstanding borrowings (as a percent) 6.11% 5.17% 6.11%    
Foreign Line of Credit | Bank Guarantees | Credit Facility With European Bank          
Line of Credit Facility [Line Items]          
Maximum amount of borrowings available $ 19,970,000   € 18,500,000