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Contract Balances and Performance Obligations - Contract Balances (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2021
Sep. 30, 2020
Contract With Customer, Liability [Roll Forward]    
Deferred revenues at September 30, 2020 * $ 122,141  
Revenue recognized that was included in the deferred revenues balance at the beginning of the period (78,551)  
Increases due to billings, excluding amounts recognized as revenue during the period 78,658  
Decrease due to divestiture of the C&R business (16,671)  
Deferred revenues at June 30, 2021 * 105,577  
Deferred revenue and other liabilities, current portion 99,800 $ 115,200
Deferred revenue and other liabilities, noncurrent $ 5,800 $ 6,900