Revenue, Deferred Revenue and Remaining Performance Obligations - Changes in Deferred Revenue (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jul. 31, 2020 |
Jul. 31, 2019 |
Jul. 31, 2020 |
Jul. 31, 2019 |
|
| Movement in Deferred Revenue [Roll Forward] | ||||
| Beginning Balance | $ 635,973 | $ 315,212 | $ 571,168 | $ 290,067 |
| Additions to deferred revenue | 252,838 | 162,658 | 495,721 | 283,880 |
| Recognition of deferred revenue | (198,971) | (108,108) | (377,049) | (204,185) |
| Ending Balance | $ 689,840 | $ 369,762 | $ 689,840 | $ 369,762 |