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Stockholders' Equity - Narrative (Details)		12 Months Ended
Stockholders' Equity - Narrative (Details)	Nov. 06, 2018 $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2022 $ / shares	Mar. 31, 2022 $ / shares	Oct. 22, 2021 shares	Jun. 15, 2021 USD ($)	Jan. 31, 2020 shares	Dec. 13, 2019 USD ($)	Sep. 30, 2019 shares	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]
Options granted (in shares)		0	0	92,610
Unrecognized compensation expense related to options outstanding \| $		$ 28,500,000
Weighted average period for unrecognized compensation expense expected to be recognized		2 years 2 months 12 days
Options to purchase common stock outstanding (in shares)		781,092	816,717	1,162,505							1,686,902
Recognized compensation expense \| $		$ 13,346,000	$ 11,532,000	$ 9,551,000
Total intrinsic value of options exercised \| $		300,000	2,700,000	$ 2,500,000
Weighted average fair value of options granted (in dollars per share) \| $ / shares				$ 4.32
Aggregate intrinsic value of options \| $		1,500,000	9,000,000
Amount authorized under share repurchase program \| $								$ 15,000,000		$ 10,000,000
Amount of shares repurchased \| $		$ 14,800,000	$ 200,000	$ 1,000,000
Number of shares repurchased (in shares)		886,204	10,555	137,000
Average price of shares repurchased (in dollars per share) \| $ / shares		$ 16.73	$ 17.99	$ 7.33
Amount of shares repurchased and retired \| $		$ 15,176,000	$ 190,000	$ 1,002,000
Preferred stock, par value per share (in dollars per share) \| $ / shares		$ 0.001	$ 0.001		$ 0.001	$ 0.001
Percentage of common stock outstanding for acquiring person under right agreement												4.90%
Series B Junior 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													0.001
Preferred stock, par value per share (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 right (in dollars per share) \| $ / shares													$ 0.0001
Preferred stock, number of rights expired, 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		2 years 3 months 18 days
Awards outstanding (in shares)		2,441,677	2,411,267	2,661,943							2,352,487
Recognized compensation expense \| $		$ 9,400,000	$ 8,100,000	$ 6,900,000
Unrecognized compensation expense \| $		$ 21,200,000
Number of previously issued awards cancelled that did not meet criteria for vesting (in shares)		344,329	161,961	266,748
Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized		2 years 2 months 12 days
Awards outstanding (in shares)		919,456	528,724	353,556							1,722,551
Recognized compensation expense \| $		$ 3,000,000	$ 1,300,000	$ 700,000
Unrecognized compensation expense \| $		$ 6,800,000
Vesting service period		3 years
Number of previously issued awards cancelled that did not meet criteria for vesting (in shares)		61,683	19,252	1,722,551
Performance RSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting service percentage		0.00%
Performance RSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting service percentage		133.00%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to options outstanding \| $		$ 300,000
Weighted average period for unrecognized compensation expense expected to be recognized		1 year
Recognized compensation expense \| $		$ 500,000	$ 700,000	$ 700,000
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 \| $		$ 100,000	800,000
Vesting service period	3 years
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)		1,477,769
2020 Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		1,494,178
2020 Plan \| Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		919,456
Prior Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase common stock outstanding (in shares)		471,303
Prior Plans \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)									107,903
Awards outstanding (in shares)		401,350
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)		391,771
Shares issued under the plan (in shares)		608,229
Recognized compensation expense \| $		$ 400,000	$ 600,000	$ 400,000
ESPP \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount rate from market price purchase date		0.15
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
Director Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase common stock outstanding (in shares)		259,513