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Stockholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 29, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Nov. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payments for repurchases of common stock |  | $ 13,346 | $ 39,049 |  |  |
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements |  | $ 15,590 |  |  |  |
Forfeiture rate, Board of Directors |  | 0.00% |  |  |  |
Forfeiture rate, non-Board of Directors |  | 9.00% |  |  |  |
Unrecognized compensation cost is expected to be recognized over a weighted-average period |  | 2 years 2 months 12 days |  |  |  |
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 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period, in years |  | 2 years |  |  |  |
2017 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of additional shares available for future grants | 1,000 |  |  |  |  |
Share-based Payment Arrangement, Tranche One [Member] | Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting rate |  | 25.00% |  |  |  |
Share-based Payment Arrangement, Tranche One [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting rate |  | 50.00% |  |  |  |
2017 Authorization [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Repurchase period in years |  | 3 years |  |  |  |
Shares of common stock repurchased |  |  | 456 |  |  |
Payments for repurchases of common stock |  |  | $ 43,253 |  |  |
2017 Authorization [Member] | 2017 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for future grants |  | 2,185 |  |  | 1,783 |
2019 Authorization [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Repurchase period in years |  | 3 years |  |  |  |
Shares of common stock repurchased |  | 124 |  |  |  |
Payments for repurchases of common stock |  | $ 13,346 |  |  |  |
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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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