Deferred Revenue - Schedule of Deferred Revenue (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Current Liabilities:
Unearned revenue	$ 112,520	$ 88,233
Total	112,520	88,233
Non-current Liabilities:
Unearned revenue	212,573	265,051
Total	$ 212,573	$ 265,051