Description of Business and Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Oct. 01, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liability	$ 215,023
Operating right-of-use lease assets	$ 149,933		$ 0
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liability		$ 224,000
Operating right-of-use lease assets		$ 167,900