Annual report pursuant to Section 13 and 15(d)

DEBT AND FINANCING ARRANGEMENTS - Narrative (Details)

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DEBT AND FINANCING ARRANGEMENTS - Narrative (Details)
12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
EUR (€)
Sep. 30, 2023
EUR (€)
Debt Instrument [Line Items]        
Other borrowings $ 776,467,000 $ 790,180,000    
Receivables Purchase Agreement        
Debt Instrument [Line Items]        
Facility limit 125,000,000      
Gain (loss) on sale of financing receivable 0      
Receivables sold to purchasers 96,300,000 101,800,000    
Unsold receivables 58,183,000 57,897,000    
Principal amount of receivables sold 70,236,000 55,159,000    
Factored accounts receivable, outstanding $ 15,665,000 $ 18,045,000    
Line of Credit | September 2024 Debt Amendment        
Debt Instrument [Line Items]        
Weighted-average interest rate on outstanding borrowings (as a percent) 4.59% 5.95% 4.59% 5.95%
2027 Senior Notes | Senior Notes 2027        
Debt Instrument [Line Items]        
Debt issued amount $ 300,000,000      
Fixed interest rate (as a percent) 8.625%   8.625%  
2025 Senior Notes        
Debt Instrument [Line Items]        
Debt issuance costs $ 5,249,000 $ 1,125,000    
Other borrowings 0 $ 298,500,000    
2025 Senior Notes | Senior Notes 2027        
Debt Instrument [Line Items]        
Debt issuance costs $ 5,249,000      
2025 Senior Notes | 2025 Senior Notes        
Debt Instrument [Line Items]        
Fixed interest rate (as a percent) 5.25%   5.25%  
Interest expense, debt $ 585,000      
Other borrowings        
Debt Instrument [Line Items]        
Weighted-average interest rate on outstanding borrowings (as a percent) 2.66% 2.95% 2.66% 2.95%
Other borrowings $ 15,602,000 $ 19,241,000    
Revolving Credit Facility | September 2024 Debt Amendment        
Debt Instrument [Line Items]        
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 $ 4,905,000      
Unamortized costs $ 4,961,000 949,000    
Revolving Credit Facility | September 2024 Debt Amendment | Minimum        
Debt Instrument [Line Items]        
Variable interest rate (as a percent) 1.00%      
Revolving Credit Facility | September 2024 Debt Amendment | Maximum        
Debt Instrument [Line Items]        
Variable interest rate (as a percent) 2.00%      
Revolving Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Other borrowings $ 444,011,000 463,168,000    
Revolving Credit Facility | Line of Credit | September 2024 Debt Amendment        
Debt Instrument [Line Items]        
Maximum amount of borrowings available $ 750,000,000      
Revolving Credit Facility | Line of Credit | September 2024 Debt Amendment | Minimum        
Debt Instrument [Line Items]        
Annual commitment fee range on unused portion 0.15%      
Revolving Credit Facility | Line of Credit | September 2024 Debt Amendment | Maximum        
Debt Instrument [Line Items]        
Annual commitment fee range on unused portion 0.30%      
Revolving Credit Facility | U.S. Dollar Denominated Borrowings | September 2024 Debt Amendment        
Debt Instrument [Line Items]        
Outstanding borrowings $ 410,527,000 405,000,000    
Revolving Credit Facility | Euro Denominated Borrowings | September 2024 Debt Amendment        
Debt Instrument [Line Items]        
Outstanding borrowings 33,485,000 $ 58,168,000 € 30,000,000.0 € 55,000,000.0
Standby Letters of Credit | Line of Credit | September 2024 Debt Amendment        
Debt Instrument [Line Items]        
Maximum amount of borrowings available 75,000,000      
Foreign Line of Credit | Credit Facility With European Bank        
Debt Instrument [Line Items]        
Maximum amount of borrowings available 11,162,000   10,000,000.0  
Outstanding borrowings | €       € 0
Foreign Line of Credit | Bank Guarantees | Credit Facility With European Bank        
Debt Instrument [Line Items]        
Maximum amount of borrowings available $ 20,649,000   € 18,500,000