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Leases - Components of lease expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Leases        
Retained earnings $ (1,103,976) $ (1,103,976) $ (701,654)  
Operating lease cost        
Operating lease cost   164,000 172,500 $ 186,500
Finance lease cost        
Impairment of leasehold and right of use assets $ 86,200      
Amortization of right-of-use assets   23,100 18,000 13,000
Interest on lease liabilities   2,600 2,200 2,000
Variable lease cost   34,100 34,000 35,500
Total lease cost   $ 223,800 $ 226,700 $ 237,000