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Stockholders' Equity - Employee Stock Purchase Plans (Details) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Jul. 03, 2021 shares | Oct. 02, 2021 USD ($) Plan period shares | Jul. 02, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of employee stock purchase plans | Plan |  | 2 |
Recognition period |  | 2 years 2 months 12 days |
Unrecognized stock-based compensation expense, stock options | $ |  | $ 27.6 |
2017 Nonqualified Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of additional shares authorized (in shares) | 800,000 |  |
Number of shares authorized (in shares) |  | 5,500,000 |
Shares available for future grant (in shares) |  | 2,900,000 |
Shares purchased under ESPP (in shares) |  | 200,000 |
Recognition period |  | 10 months 24 days |
Maximum contribution percent (up to 25%) |  | 25.00% |
Employee termination period following purchase date to receive shares subject to risk of forfeiture |  | 1 year |
Number of offering periods | period |  | 2 |
Offering period |  | 6 months |
Number of shares authorized per purchase period (in shares) |  | 500,000 |
Unrecognized stock-based compensation expense, stock options | $ |  | $ 4.8 |
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
ESPP, maximum employee payroll deduction percentage |  | 15.00% |
ESPP, maximum number of shares per employee (in shares) |  | 2,000 |
Offering period |  | 6 months |
ESPP, discounted purchase price percentage |  | 85.00% |
Number of additional shares authorized (in shares) | 1,300,000 |  |
Number of shares authorized (in shares) | 11,100,000 |  | 9,800,000
Shares available for future grant (in shares) |  | 3,600,000 |
Shares purchased under ESPP (in shares) |  | 300,000 |
Unrecognized stock-based compensation expense | $ |  | $ 1.1 |
Recognition period |  | 4 months 24 days |
Offering period |  | 6 months |

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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=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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