Financial Instruments and Fair Value - Schedule of Available-for-Sale Securities at Fair Value (Detail) - USD ($)
$ in Thousands |
Jan. 31, 2022 |
Jan. 31, 2021 |
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost |
$ 20
|
$ 213,583
|
| Unrealized Gains |
0
|
1,226
|
| Unrealized Losses |
0
|
(7)
|
| Fair Value |
20
|
214,802
|
| Money market funds [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost |
20
|
171
|
| Unrealized Gains |
0
|
0
|
| Unrealized Losses |
0
|
0
|
| Fair Value |
20
|
171
|
| Commercial paper [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost |
0
|
66,181
|
| Unrealized Gains |
0
|
0
|
| Unrealized Losses |
0
|
0
|
| Fair Value |
0
|
66,181
|
| Corporate bonds [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost |
0
|
102,108
|
| Unrealized Gains |
0
|
980
|
| Unrealized Losses |
0
|
(7)
|
| Fair Value |
0
|
103,081
|
| Asset-backed securities [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost |
0
|
15,740
|
| Unrealized Gains |
0
|
164
|
| Unrealized Losses |
0
|
0
|
| Fair Value |
0
|
15,904
|
| U.S. government securities [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost |
0
|
29,383
|
| Unrealized Gains |
0
|
82
|
| Unrealized Losses |
0
|
0
|
| Fair Value |
$ 0
|
$ 29,465
|