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Stock-Based Compensation - Employee Stock Purchase Plan (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2021 | Apr. 30, 2021 | Jul. 31, 2020 | Apr. 30, 2020 | Sep. 15, 2021 | Jul. 31, 2021 | Mar. 15, 2021 | Jul. 31, 2020 | Jan. 31, 2021 | Feb. 01, 2021 | Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan |  | $ 3,817 |  | $ 3,743 |  | $ 3,817 |  |  | $ 7,000 |  |
Stock-based compensation expense | $ 20,402 |  | $ 17,230 |  |  | $ 35,000 |  | $ 34,602 |  |  |
Shares committed under 2017 ESPP |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized, annual increase (in shares) |  |  |  |  |  |  |  |  |  | 1,239,891 | 2,500,000
Number of shares authorized, annual increase, percentage of outstanding shares at the end of prior fiscal year |  |  |  |  |  |  |  |  |  |  | 1.00%
Number of shares authorized (in shares) | 3,792,329 |  |  |  |  | 3,792,329 |  |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  |  |  |  |  |  | 282,119 |  |  |  |
Shares purchased under plan (in dollars per share) |  |  |  |  |  |  | $ 13.53 |  |  |  |
Issuance of common stock under employee stock purchase plan |  |  |  |  |  |  | $ 3,800 |  |  |  |
Employee withholdings for future purchases under the ESPP | $ 2,800 |  |  |  |  | $ 2,800 |  |  |  |  |
Expected life (in years) | 6 months |  |  |  |  |  |  | 6 months |  |  |
Expected volatility rate | 59.24% |  | 51.44% |  |  |  |  |  |  |  |
Risk free interest rate | 0.06% |  | 0.29% |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 500 |  | $ 600 |  |  | 1,100 |  | $ 1,200 |  |  |
Unrecognized compensation cost | $ 300 |  |  |  |  | $ 300 |  |  |  |  |
Unrecognized compensation cost, period for recognition (in years) |  |  |  |  |  | 1 month 17 days |  |  |  |  |
Maximum payroll deduction (as a percent of eligible compensation) |  |  |  |  |  | 15.00% |  |  |  |  |
Purchase price of common stock (as a percent) |  |  |  |  |  | 85.00% |  |  |  |  |
Shares committed under 2017 ESPP | Forecast |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  |  |  |  | 207,120 |  |  |  |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 + Details
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