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Stock-Based Compensation - Employee Stock Purchase Plan (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 21, 2021	Oct. 31, 2021	Apr. 30, 2021	Oct. 31, 2020	Apr. 30, 2020	Mar. 15, 2022	Mar. 15, 2021	Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021	Sep. 15, 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		$ 2,668	$ 3,817	$ 3,257	$ 3,743			$ 6,485		$ 7,000
Stock-based compensation expense		$ 19,455		19,287				$ 54,455	$ 53,889
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)		3,543,696						3,543,696
Issuance of common stock under employee stock purchase plan (in shares)	248,633						282,119
Shares purchased under plan (in dollars per share)							$ 13.53				$ 10.73
Issuance of common stock under employee stock purchase plan	$ 2,700						$ 3,800
Employee withholdings for future purchases under the ESPP		$ 800						$ 800
Stock-based compensation expense		500		$ 700				1,600	$ 1,900
Unrecognized compensation cost		$ 700						$ 700
Unrecognized compensation cost, period for recognition (in years)								4 months 13 days
Maximum payroll deduction (as a percent of eligible compensation)								15.00%
Purchase price of common stock (as a percent)								85.00%
Expected volatility, minimum								45.54%	51.44%
Expected volatility, maximum								59.24%	65.48%
Risk-free rate, minimum								0.05%	0.12%
Risk-free rate, maximum								0.06%	0.29%
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)						282,162

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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.

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The estimated measure of the maximum 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.

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The estimated measure of the minimum 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.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement.

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