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)
 9 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
EUR (€)
Sep. 30, 2023
USD ($)
Sep. 30, 2023
EUR (€)
Line of Credit Facility [Line Items]          
Other borrowings $ 830,221,000     $ 790,180,000  
2025 Senior Notes          
Line of Credit Facility [Line Items]          
Unamortized debt costs 720,000     1,125,000  
Other borrowings $ 298,497,000     298,500,000  
Other borrowings          
Line of Credit Facility [Line Items]          
Weighted-average interest rate on outstanding borrowings (as a percent) 2.61% 2.44% 2.61%    
Other borrowings $ 16,744,000     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 105,100,000     101,800,000  
Unsold receivables 52,464,000     57,897,000  
Principal amount of receivables sold 53,087,000 $ 36,045,000      
Factored accounts receivable, outstanding 16,424,000     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        
Rate spread adjustment (as a percent) 0.10%        
Interest rate during period (as a percent) 1.50%        
Debt issuance costs, gross $ 4,704,000        
Unamortized debt costs $ 5,063,000     949,000  
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 $ 55,000,000        
Outstanding borrowings $ 436,632,000     405,000,000  
Weighted-average interest rate on outstanding borrowings (as a percent) 4.61% 5.59% 4.61%    
Foreign Line of Credit          
Line of Credit Facility [Line Items]          
Outstanding borrowings $ 58,947,000   € 55,000,000.0 $ 58,168,000 € 55,000,000.0
Foreign Line of Credit | Credit Facility With European Bank          
Line of Credit Facility [Line Items]          
Maximum amount of borrowings available 10,718,000   10,000,000.0    
Outstanding borrowings $ 3,088,000   € 2,900,000   € 0
Weighted-average interest rate on outstanding borrowings (as a percent) 5.88% 5.65% 5.88%    
Foreign Line of Credit | Bank Guarantees | Credit Facility With European Bank          
Line of Credit Facility [Line Items]          
Maximum amount of borrowings available $ 19,828,000   € 18,500,000