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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Sep. 30, 2023
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, 2023, 2022, and 2021 (in thousands):
202320222021
Balance, beginning of year$77,220 $77,836 $70,396 
Additional capitalized contract acquisition costs26,960 37,897 41,719 
Amortization of capitalized contract acquisition costs(37,712)(38,513)(34,279)
Balance, end of year$66,468 $77,220 $77,836 
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, 2023, 2022, and 2021 (in thousands):
202320222021
Balance, beginning of year$1,691,580 $1,489,842 $1,272,632 
Amounts added but not recognized as revenues1,162,698 1,167,143 1,122,081 
Deferred revenue acquired through acquisition of businesses1,800 10,591 779 
Revenues recognized related to the opening balance of deferred revenue(1,080,957)(975,996)(905,650)
Balance, end of year$1,775,121 $1,691,580 $1,489,842