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 6 Months Ended 12 Months Ended 24 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Feb. 28, 2022
USD ($)
Mar. 31, 2022
EUR (€)
Sep. 30, 2021
EUR (€)
Mar. 31, 2021
Line of Credit Facility [Line Items]              
Other borrowings $ 752,964,000 $ 752,964,000 $ 763,710,000        
Designated as Hedging Instrument              
Line of Credit Facility [Line Items]              
Unrealized loss expected to be recognized over the next 12 months 839,000 839,000          
Designated as Hedging Instrument | Interest rate swap contracts | Cash Flow Hedging              
Line of Credit Facility [Line Items]              
Net unrealized gain (loss)   5,318,000 (2,062,000)        
Unrealized loss on fair value of interest rate swaps, after tax   4,015,000 (1,558,000)        
Derivative, notional amount 225,000,000 225,000,000 250,000,000        
Designated as Hedging Instrument | Currency Swap | Net Investment Hedging              
Line of Credit Facility [Line Items]              
Derivative, notional amount 94,464,000 94,464,000          
Net investment hedge, gain, after reclassification and tax   2,893,000 29,000        
Net investment hedge, gain, after reclassification, tax   939,000 10,000        
Designated as Hedging Instrument | Currency Swap | Net Investment Hedging | Other Noncurrent Assets              
Line of Credit Facility [Line Items]              
Derivative asset, noncurrent 3,832,000 3,832,000 39,000        
Designated as Hedging Instrument | Currency Swap | Net Investment Hedging | Interest Expense              
Line of Credit Facility [Line Items]              
Net investment hedge income 420,000 785,000          
2025 Senior Notes              
Line of Credit Facility [Line Items]              
Unamortized debt costs 1,935,000 1,935,000 2,204,000        
Other borrowings $ 298,065,000 $ 298,065,000 $ 297,796,000        
Other borrowings              
Line of Credit Facility [Line Items]              
Weighted-average interest rate on outstanding borrowings (as a percent) 1.92% 1.92% 2.18%   1.92% 2.18%  
Other borrowings $ 58,522,000 $ 58,522,000 $ 10,150,000        
Foreign Line of Credit | Credit Facility With European Bank              
Line of Credit Facility [Line Items]              
Maximum amount of borrowings available 27,789,000 27,789,000     € 25,000,000    
Outstanding borrowings $ 8,676,000 $ 8,676,000 817,000   € 7,800,000 € 700,000  
Weighted-average interest rate on outstanding borrowings (as a percent) 2.25% 2.25%     2.25%   2.25%
Foreign Line of Credit | Bank Guarantees | Credit Facility With European Bank              
Line of Credit Facility [Line Items]              
Maximum amount of borrowings available $ 8,893,000 $ 8,893,000     € 8,000,000    
March 2020 Debt Amendment | Revolving credit facilities              
Line of Credit Facility [Line Items]              
Maximum amount of borrowings available 750,000,000 750,000,000          
Maximum borrowing amount drawn In foreign currency 350,000,000 350,000,000          
Unamortized debt costs 1,826,000 $ 1,826,000 2,182,000        
March 2020 Debt Amendment | Revolving credit facilities | Minimum              
Line of Credit Facility [Line Items]              
Annual commitment fee range on unused portion (as a percent)   0.15%          
March 2020 Debt Amendment | Revolving credit facilities | Maximum              
Line of Credit Facility [Line Items]              
Annual commitment fee range on unused portion (as a percent)   0.30%          
March 2020 Debt Amendment | Revolving credit facilities | LIBOR              
Line of Credit Facility [Line Items]              
Interest rate during period (as a percent)   1.00%          
March 2020 Debt Amendment | Revolving credit facilities | LIBOR | Minimum              
Line of Credit Facility [Line Items]              
Interest rate on borrowings (as a percent)   0.75%          
March 2020 Debt Amendment | Revolving credit facilities | LIBOR | Maximum              
Line of Credit Facility [Line Items]              
Interest rate on borrowings (as a percent)   2.00%          
March 2020 Debt Amendment | Domestic Revolving Credit Facility              
Line of Credit Facility [Line Items]              
Maximum available for issuance of trade and standby letters of credit $ 35,000,000 $ 35,000,000          
Weighted-average interest rate on outstanding borrowings (as a percent) 1.89% 1.89%     1.89%   2.17%
March 2020 Debt Amendment | Domestic Revolving Credit Facility | United States of America, Dollars              
Line of Credit Facility [Line Items]              
Outstanding borrowings $ 380,540,000 $ 380,540,000 $ 349,780,000        
Senior Notes 2025 | 2025 Senior Notes              
Line of Credit Facility [Line Items]              
Debt issued amount $ 300,000,000 $ 300,000,000          
Fixed interest rate (as a percent) 5.25% 5.25%     5.25%    
Receivables Purchase Agreement              
Line of Credit Facility [Line Items]              
Facility limit $ 125,000 $ 125,000          
Gross receivables sold 121,616,000 121,616,000          
Cash collections   46,615,000          
Receivables sold to Purchasers 75,001,000 75,001,000          
Unsold receivables 29,288,000 29,288,000          
Receivables Purchase Agreement | Other borrowings              
Line of Credit Facility [Line Items]              
Other borrowings $ 37,789,000 $ 37,789,000          
Securitization facility              
Line of Credit Facility [Line Items]              
Maximum amount of borrowings available       $ 115,000      
Outstanding borrowings       $ 95,990,000      
Interest rate on facility (as a percent)             0.86%
Securitization facility | Minimum              
Line of Credit Facility [Line Items]              
Commitment fee (as a percent)       0.25%      
Securitization facility | Maximum              
Line of Credit Facility [Line Items]              
Commitment fee (as a percent)       0.35%      
Securitization facility | LIBOR              
Line of Credit Facility [Line Items]              
Interest rate on borrowings (as a percent)       0.75%