Annual report pursuant to Section 13 and 15(d)

BORROWINGS - Notes Payable Narrative (Details)

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BORROWINGS - Notes Payable Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Aug. 31, 2023
Nov. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Oct. 31, 2019
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Apr. 30, 2022
Nov. 01, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Debt Instrument [Line Items]                                  
Aggregate principal amount           $ 257,000,000 $ 200,000,000 $ 188,813,000     $ 96,313,000 $ 57,500,000 $ 0 $ 0 $ 0 $ 0 $ 0
Proceeds from issuance of notes payable           57,000,000 50,000,000 $ 150,000,000                  
Interest payable           2,956,000 $ 2,517,000                    
Notes Payable | 7.75% Notes due 2028                                  
Debt Instrument [Line Items]                                  
Aggregate principal amount $ 57,000,000                                
Interest rate 7.75%                                
Proceeds from issuance of notes payable $ 55,100,000                                
Interest payable $ 4,400,000                                
Notes payable, fair value disclosure           57,100,000                      
Notes Payable | 3.75% Notes due 2027                                  
Debt Instrument [Line Items]                                  
Aggregate principal amount   $ 50,000,000                              
Interest rate   3.75%             3.75%                
Proceeds from issuance of notes payable   $ 48,500,000                              
Interest payable   $ 1,900,000                              
Notes payable, fair value disclosure           44,500,000                      
Notes Payable | 5.125% Notes due 2026                                  
Debt Instrument [Line Items]                                  
Aggregate principal amount     $ 50,000,000 $ 100,000,000                          
Interest rate     5.125% 5.125%                          
Proceeds from issuance of notes payable     $ 50,600,000 $ 97,700,000                          
Interest payable     $ 7,700,000                            
Notes payable, fair value disclosure           $ 143,100,000                      
Notes Payable | 5.375% Notes due 2024                                  
Debt Instrument [Line Items]                                  
Aggregate principal amount         $ 38,800,000         $ 38,800,000              
Interest rate         5.375%                        
Proceeds from issuance of notes payable         $ 37,500,000