Employee Benefits and Stock-based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions |
1 Months Ended |
2 Months Ended |
3 Months Ended |
12 Months Ended |
Nov. 30, 2021 |
Jun. 30, 2021 |
Jun. 30, 2021 |
Apr. 30, 2021 |
Apr. 30, 2020 |
Jan. 31, 2022 |
Jan. 31, 2021 |
Jan. 31, 2020 |
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Contribution expense |
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$ 0.6
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| Accrued share based compensation expense |
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$ 7.8
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| Closing price of stock |
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$ 140.15
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| Stock options [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Total unrecognized compensation cost, stock options |
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$ 27.7
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| Weighted average recognition period |
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2 years 6 months 10 days
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| Restricted Stock and Restricted Stock Units [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Total fair value of vesting dates of restricted stock and restricted stock units vested |
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$ 192.5
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$ 69.0
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$ 52.1
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| Restricted stock units [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Weighted average recognition period |
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2 years 3 months 25 days
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| Total unrecognized compensation cost, restricted stock units |
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$ 194.4
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| Aggregate intrinsic value of unvested restricted stock units |
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$ 371.6
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| 2021 Equity Incentive Plan [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Ordinary shares reserved for issuance |
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1,350,000
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| Maximum number of ordinary shares reserved for issuance |
|
6,834,208
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6,834,208
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| 2012 Equity Incentive Plan [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Additional ordinary shares reserved for issuance |
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0
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1,599,634
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1,521,252
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| Voting power of all classes of company's shares |
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10.00%
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| 2012 Equity Incentive Plan [Member] | Stock options [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Option's term of up to 10 years from grant date |
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10 years
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10 years
|
10 years
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| Vesting schedule |
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vest 25% on the first anniversary service date of the grant and the remainder vest ratably over the following 36 months.
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| 2012 Equity Incentive Plan [Member] | Restricted Stock and Restricted Stock Units [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Vesting schedule |
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1/4th of the shares on the first anniversary service date of the grant and 1/16th of the shares vest every 3 months thereafter, so as to be 100% vested on the fourth anniversary of the vesting commencement date
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| 2017 Stock Option Plan [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Additional ordinary shares reserved for issuance |
0
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| Incentive stock options granted to 10% ownership [Member] | Stock options [Member] | Minimum [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Purchase price of ordinary shares, percentage |
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110.00%
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| Non statutory stock options and incentive stock options granted to less than 10% ownership [Member] | Stock options [Member] | Minimum [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Purchase price of ordinary shares, percentage |
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100.00%
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| ESPP [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Purchase price of ordinary shares, percentage |
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85.00%
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85.00%
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85.00%
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| Percentage of salary contribution by employees |
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15.00%
|
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| Additional ordinary shares reserved for issuance |
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444,343
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422,570
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| ESPP [Member] | Scenario, plan automatically increased by the lessor of [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Annual increase in ordinary shares for available for future issuance |
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1,500,000
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1,500,000
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| Annual shares increase for future issuance by percentage under 2012 employee stock purchase plan |
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1.25%
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1.25%
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