v3.25.2
Debt and Financing Arrangements - Narrative (Details)
 9 Months Ended
Mar. 11, 2025
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
Aug. 01, 2025
USD ($)
Jun. 30, 2025
EUR (€)
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2024
EUR (€)
Line of Credit Facility [Line Items]              
Accounts payable, trade   $ 4,398,000       $ 3,014,000  
Other borrowings   $ 702,499,000       776,467,000  
Common Class A              
Line of Credit Facility [Line Items]              
Shares issued with shelf registration (in shares) | shares 1,250,000            
Common Class A | ATM Program              
Line of Credit Facility [Line Items]              
Shares issued with shelf registration (in shares) | shares 3,000,000            
Shares remaining for sale | shares   1,250,000     1,250,000    
2027 Senior Secured Notes              
Line of Credit Facility [Line Items]              
Debt issuance costs, gross   $ 4,371,000       5,249,000  
Other borrowings   $ 295,629,000       294,751,000  
Other borrowings              
Line of Credit Facility [Line Items]              
Weighted-average interest rate on outstanding borrowings (as a percent)   3.42% 2.61%   3.42%    
Other borrowings   $ 5,836,000       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   $ 110,000,000          
Receivables sold to purchasers   85,600,000       96,300,000  
Unsold receivables   79,495,000       58,183,000  
Principal amount of receivables sold   45,813,000 $ 53,087,000        
Factored accounts receivable, outstanding           15,665,000  
Receivables Purchase Agreement | Subsequent Event              
Line of Credit Facility [Line Items]              
Facility limit       $ 75,000,000      
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   $ 4,218,000       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   $ 380,420,000       410,527,000  
Weighted-average interest rate on outstanding borrowings (as a percent)   4.16% 4.61%   4.16%    
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   $ 7,046,000     6,000,000.0    
Outstanding borrowings   $ 366,000     € 311,000   € 0
Weighted-average interest rate on outstanding borrowings (as a percent)   4.16% 5.88%   4.16%    
Foreign Line of Credit | Bank Guarantees | Credit Facility With European Bank              
Line of Credit Facility [Line Items]              
Maximum amount of borrowings available   $ 16,441,000     € 14,000,000.0