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Stockholders' Equity - Narrative (Details)		3 Months Ended		6 Months Ended		12 Months Ended
Stockholders' Equity - Narrative (Details)	Nov. 06, 2018 $ / shares shares	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) shares	Dec. 16, 2020 USD ($) $ / shares shares	Oct. 22, 2021 shares	Sep. 30, 2021 $ / shares shares	Jun. 15, 2021 USD ($)	Jan. 31, 2020 shares	Dec. 13, 2019 USD ($)	Feb. 28, 2019	Oct. 23, 2018 $ / right $ / shares shares	Mar. 07, 2018 shares	Mar. 10, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to outstanding stock options and RSUs \| $		$ 34,000,000		$ 34,000,000
Weighted average period for unrecognized compensation expense expected to be recognized (in years)				2 years 7 months 6 days
Purchase of common stock (in shares)		791,092		791,092				816,717
Recognized compensation expense \| $		$ 3,298,000	$ 2,968,000	$ 6,429,000	$ 5,715,000
Total intrinsic value of options exercised \| $				$ 200,000	$ 1,400,000
Options granted (in shares)				0	0
Amount authorized and approved under share repurchase program \| $									$ 15,000,000		$ 10,000,000
Amount of shares repurchased \| $		$ 4,700,000		$ 14,800,000		$ 1,000,000
Number of shares repurchased (in shares)		287,568		886,204		137,000
Average price of shares repurchased (in dollars per share) \| $ / shares		$ 16.29		$ 16.73		$ 7.33
Preferred stock, par value (in dollars per share) \| $ / shares		$ 0.001		$ 0.001				$ 0.001
Percentage of common stock outstanding for acquiring person under right agreement												4.90%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount rate from market price, purchase date				15.00%
Series B Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of preferred share purchase right for each share of common stock (in shares)													1
Preferred stock, share conversion ratio													0.001000
Preferred stock, par value (in dollars per share) \| $ / shares													$ 0.001
Preferred stock, purchase price per right (in dollars per right) \| $ / right													35.00
Preferred stock, redemption price per share (in dollars per share) \| $ / shares													$ 0.0001
Number of rights redeemed or exchanged (in shares)							0
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)				2 years 7 months 6 days
Awards outstanding (in shares)		2,351,708		2,351,708				2,411,267
Recognized compensation expense \| $		$ 2,300,000	2,100,000	$ 4,600,000	$ 4,000,000
Unrecognized compensation expense related to nonvested awards \| $		$ 22,200,000		$ 22,200,000
Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)				2 years 7 months 6 days
Awards outstanding (in shares)		922,888		922,888				528,724
Recognized compensation expense \| $		$ 700,000	300,000	$ 1,200,000	600,000
Unrecognized compensation expense related to nonvested awards \| $		8,800,000		$ 8,800,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)				1 year 7 months 6 days
Recognized compensation expense \| $		100,000	200,000	$ 300,000	400,000
Unrecognized compensation expense of stock options \| $		500,000		500,000
Performance options \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock reserved for future grants (in shares)	800,000
Recognized compensation expense \| $		$ 0	200,000	$ 100,000	400,000
Exercise price per share (in dollars per share) \| $ / shares	$ 9.50
2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)										4,500,000
Number of common stock reserved for future grants (in shares)		1,643,289		1,643,289
2020 Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		1,314,077		1,314,077
2020 Plan \| Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		755,533		755,533
Prior Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)										107,903
Purchase of common stock (in shares)		481,303		481,303
Prior Plans \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		505,957		505,957
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)														1,000,000
Number of common stock reserved for future grants (in shares)		450,151		450,151
Issuance of common stock under employee stock purchase plan (in shares)				549,849
Recognized compensation expense \| $		$ 100,000	$ 200,000	$ 300,000	$ 300,000
ESPP \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount rate from market price, offering date				15.00%
Director Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)															1,500,000
Number of common stock reserved for future grants (in shares)		144,412		144,412
Director Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock (in shares)		259,513		259,513