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Stockholders' Equity (Narrative) (Details) - USD ($) $ in Thousands |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 27, 2021 | Jan. 29, 2020 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of additional shares available for future grants | 1,500,000 |  |  |  |
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements |  |  | $ 15,693 |  |
Forfeiture rate, Board of Directors |  |  | 0.00% |  |
Forfeiture rate, non-Board of Directors |  |  | 7.30% |  |
Unrecognized compensation cost is expected to be recognized over a weighted-average period |  |  | 2 years 1 month 6 days |  |
2017 Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of additional shares available for future grants |  | 1,000,000 |  |  |
Stock Options [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Vested contractual term, in years |  |  | 10 years |  |
Vesting period, in years |  |  | 4 years |  |
Stock Options [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Vesting rate |  |  | 25.00% |  |
2017 Authorization [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Repurchase period in years |  |  | 3 years |  |
2017 Authorization [Member] | 2017 Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares available for future grants |  |  | 2,692,000 | 1,972,000 |
2019 Authorization [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  | $ 13,346
Repurchase period in years |  |  | 3 years |  |
Stock repurchase program, number of shares authorized to be repurchased |  |  | 0 |  | 124,000
Maximum [Member] | 2017 Authorization [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 500,000 |  |
Maximum [Member] | 2019 Authorization [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 500,000 |  |

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