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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Sep. 30, 2022
Revenue from Contracts with Customers [Abstract]  
Capitalized Contract Cost
The table below shows significant movements in capitalized contract acquisition costs (current and noncurrent) for the years ended September 30, 2022, 2021, and 2020 (in thousands):
202220212020
Balance, beginning of year$77,836 $70,396 $59,446 
Additional capitalized contract acquisition costs37,897 41,719 43,557 
Amortization of capitalized contract acquisition costs(38,513)(34,279)(32,607)
Balance, end of year$77,220 $77,836 $70,396 
Contract with Customer, Asset and Liability The table below shows significant movements in the deferred revenue balances (current and noncurrent) for the years ended September 30, 2022, 2021, and 2020 (in thousands):
202220212020
Balance, beginning of year$1,489,842 $1,272,632 $1,198,116 
Amounts added but not recognized as revenues1,167,143 1,122,081 850,022 
Deferred revenue acquired through acquisition of businesses10,591 779 39,000 
Revenues recognized related to the opening balance of deferred revenue(975,996)(905,650)(814,506)
Balance, end of year$1,691,580 $1,489,842 $1,272,632