Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands |
Sep. 30, 2019 |
Mar. 31, 2019 |
|---|---|---|
| Summary Of Significant Accounting Policies [Line Items] | ||
| Operating lease right-of-use assets | $ 250,225 | |
| Operating lease, liability | $ 334,523 | |
| ASU 2016-02 | ||
| Summary Of Significant Accounting Policies [Line Items] | ||
| Operating lease right-of-use assets | $ 284,500 | |
| Operating lease, liability | $ 375,400 |