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Leases - Components of lease expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Oct. 01, 2019
New Accounting Pronouncements and Changes in Accounting            
(Accumulated deficits) Retained earnings $ (483,362)   $ (483,362)   $ 174,248  
Operating lease cost            
Operating lease cost 46,300 $ 49,300 141,000 $ 144,700    
Finance lease cost:            
Amortization of right-of-use assets 3,900 4,200 10,300 13,900    
Interest on lease liabilities 600 400 1,800 1,400    
Variable lease cost 8,500 8,800 27,200 27,100    
Total lease cost $ 59,300 $ 62,700 $ 180,300 $ 187,100    
ASU 2016-02            
New Accounting Pronouncements and Changes in Accounting            
(Accumulated deficits) Retained earnings           $ (87,800)