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Leases - Components of lease expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Oct. 01, 2019
New Accounting Pronouncements and Changes in Accounting        
Accumulated deficits $ (701,654) $ (504,126)    
Operating lease cost        
Operating lease cost 172,500 186,500 $ 191,600  
Finance lease cost        
Amortization of right-of-use assets 18,000 13,000 17,100  
Interest on lease liabilities 2,200 2,000 1,900  
Variable lease cost 34,000 35,500 36,500  
Total lease cost $ 226,700 $ 237,000 $ 247,100  
ASU 2016-02        
New Accounting Pronouncements and Changes in Accounting        
Accumulated deficits       $ 87,800