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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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