Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT - Narrative (Details)

v3.21.2
LONG-TERM DEBT - Narrative (Details)
£ in Thousands
12 Months Ended
Nov. 09, 2020
GBP (£)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2021
EUR (€)
Sep. 30, 2020
EUR (€)
Sep. 30, 2014
GBP (£)
Debt Instrument [Line Items]              
Other borrowings   $ 763,710,000 $ 834,534,000        
Currency translation adjustment gain (loss)   (5,370,000) (4,377,000)        
Currency translation adjustment, tax   (1,743,000) (1,420,000)        
Contested letter of credit | £ £ 10,450            
Designated as Hedging Instrument              
Debt Instrument [Line Items]              
Loss included in AOCI expected to be recognized over the next 12 months   1,428,000          
Interest Rate Swaps | Cash Flow Hedging | Interest Expense              
Debt Instrument [Line Items]              
Currency translation adjustment gain (loss)   (2,453,000) (650,000) $ 2,402,000      
Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument              
Debt Instrument [Line Items]              
Net unrealized loss   2,062,000 7,792,000        
Net unrealized loss after tax   1,558,000 5,884,000        
Derivative, notional amount   250,000,000 312,500,000        
Currency Swap | Net Investment Hedging | Designated as Hedging Instrument              
Debt Instrument [Line Items]              
Derivative, notional amount   $ 94,464,000          
Derivative, term of contract   7 years          
Net investment hedge, gain, after reclassification and tax   $ 22,000          
Net investment hedge, gain, after reclassification, tax   (7,000)          
Currency Swap | Net Investment Hedging | Designated as Hedging Instrument | Interest Expense              
Debt Instrument [Line Items]              
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax   63,000          
Securitization facility              
Debt Instrument [Line Items]              
Maximum amount of borrowings available   115,000,000          
Outstanding borrowings   $ 95,990,000 $ 67,700,000        
Interest rate (as a percent)   0.83% 0.90%   0.83% 0.90%  
Securitization facility | LIBOR              
Debt Instrument [Line Items]              
Variable interest rate (as a percent)   0.75%          
Securitization facility | Minimum              
Debt Instrument [Line Items]              
Commitment fee (as a percent)   0.25%          
Securitization facility | Maximum              
Debt Instrument [Line Items]              
Commitment fee (as a percent)   0.35%          
Line of Credit | March 2020 Debt Amendment              
Debt Instrument [Line Items]              
Weighted-average interest rate on outstanding borrowings (as a percent)   2.03% 2.41%   2.03% 2.41%  
2025 Senior Notes              
Debt Instrument [Line Items]              
Debt issued   $ 300,000,000          
Fixed interest rate (as a percent)   5.25%     5.25%    
Debt issuance costs   $ 2,204,000 $ 2,744,000        
Other borrowings   $ 297,796,000 $ 297,256,000        
Other borrowings              
Debt Instrument [Line Items]              
Weighted-average interest rate on outstanding borrowings (as a percent)   2.19% 2.10%   2.19% 2.10%  
Other borrowings   $ 10,150,000 $ 20,742,000        
Revolving Credit Facility | March 2020 Debt Amendment              
Debt Instrument [Line Items]              
Maximum borrowing amount drawn In foreign currency   350,000,000          
Unamortized costs   2,182,000 2,734,000        
Revolving Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Other borrowings   350,597,000 416,793,000        
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment              
Debt Instrument [Line Items]              
Maximum amount of borrowings available   750,000,000          
Outstanding borrowings   $ 349,780,000 257,439,000        
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment | LIBOR              
Debt Instrument [Line Items]              
Interest rate on borrowings (as a percent)   1.00%     1.00%    
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment | Minimum              
Debt Instrument [Line Items]              
Annual commitment fee range on unused portion   0.15%          
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment | Minimum | LIBOR              
Debt Instrument [Line Items]              
Interest rate on borrowings, based on leverage ratio   0.75%          
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment | Maximum              
Debt Instrument [Line Items]              
Annual commitment fee range on unused portion   0.30%          
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment | Maximum | LIBOR              
Debt Instrument [Line Items]              
Interest rate on borrowings, based on leverage ratio   2.00%          
Senior secured term loan | Line of Credit | March 2020 Debt Amendment              
Debt Instrument [Line Items]              
Maximum amount of borrowings available   $ 35,000,000          
Standby Letters of Credit | Line of Credit | March 2020 Debt Amendment              
Debt Instrument [Line Items]              
Maximum amount of borrowings available   35,000,000          
Line of Credit | Euro Member Countries, Euro | March 2020 Debt Amendment              
Debt Instrument [Line Items]              
Outstanding borrowings   0 137,188,000     € 117,000,000  
Foreign Line of Credit | Credit Facility With European Bank              
Debt Instrument [Line Items]              
Maximum amount of borrowings available   28,976,000     € 25,000,000    
Outstanding borrowings   $ 817,000 $ 22,166,000   € 704,000 € 18,900,000  
Weighted-average interest rate on outstanding borrowings (as a percent)   2.25% 1.25%   2.25% 1.25%  
Foreign Line of Credit | Bank Guarantees | Credit Facility With European Bank              
Debt Instrument [Line Items]              
Maximum amount of borrowings available   $ 9,272,000     € 8,000,000    
Term Loan | March 2020 Debt Amendment              
Debt Instrument [Line Items]              
Outstanding borrowings   0 $ 22,359,000        
Letter of Credit | Other current assets              
Debt Instrument [Line Items]              
Maximum amount of borrowings available   $ 11,535,000         £ 8,570