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Share-Based Compensation (Tables) | 3 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Effects of Stock-Based Compensation Expense Related to Stock-Based Awards to Employees and Nonemployees | The following table shows a summary of share-based compensation expense included in the condensed consolidated statements of operations (in thousands):
| Three Months Ended |  |
| December 31, 2021 |  | January 1, 2021 |  |  |  |
Cost of revenue | $ | 1,033 |  |  | $ | 871 |  |  |  |  |
Research and development | 3,599 |  |  | 3,554 |  |  |  |  |
Selling, general and administrative | 5,317 |  |  | 5,706 |  |  |  |  |
Total share-based compensation expense | $ | 9,949 |  |  | $ | 10,131 |  |  |  |  |
Summary of Restricted Stock, Restricted Stock Unit and Performance-based Restricted Stock Unit Activity | A summary of stock award activity for the three months ended December 31, 2021 is as follows:
| Number of shares (in thousands) |  | Weighted- Average Grant Date Fair Value
Balance as of October 1, 2021 | 2,351 |  |  | $ | 24.57 |
Granted | 913 |  |  | 53.08 |
Vested and released | (969) |  |  | 22.99 |
Forfeited, canceled or expired | (40) |  |  | 27.54 |
Balance as of December 31, 2021 | 2,255 |  |  | $ | 36.73 |
Schedule of Share-Based Payment Award, Market Based Restricted Stock Awards, Valuation Assumptions | The significant assumptions used in the Monte Carlo simulation to calculate the fair value of these market-based PRSUs are as follows:
| Three Months Ended
| December 31, 2021
Grant date stock price | $ | 66.12 |
Average stock price at the start of the performance period | $ | 64.11 |
Risk free interest rate | 0.8 | %
Years to maturity | 3.00
Expected volatility rate | 57.8 | %
Expected dividend yield | — |
Share-based Payment Arrangement, Option, Activity | A summary of stock option activity for the three months ended December 31, 2021 is as follows (in thousands, except per share amounts and contractual term):
| Number of Shares |  | Weighted-Average Exercise Price per Share |  | Weighted-Average Remaining Contractual Term (in Years) |  | Aggregate Intrinsic Value
Options outstanding as of October 1, 2021 | 205 |  |  | $ | 14.29 |  |  |  |  |
Exercised | (190) |  |  | 14.15 |  |  |  |  |
Forfeited, canceled or expired | — |  |  | — |  |  |  |  |
Options outstanding as of December 31, 2021 | 15 |  |  | $ | 16.06 |  |  | 3.85 |  | $ | 934 |
Options vested and exercisable as of December 31, 2021 | 15 |  |  | 16.06 |  |  | 3.85 |  | 934 |

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- Definition Schedule of Share-Based Payment Award, Market Based Restricted Stock Awards, Valuation Assumptions + References No definition available. + Details
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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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