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Balance Sheet Details - Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Sep. 30, 2019
Balance Sheet Details [Abstract]    
Contract assets $ 123,947 $ 79,407
Prepaid expenses 50,914 49,051
Capitalized contract acquisition costs 28,111 28,228
Other 35,191 26,188
Other Assets, Current $ 238,163 $ 182,874