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Equity Plans | 6 Months Ended
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Mar. 04, 2021
Share-based Payment Arrangement [Abstract] |
Equity Plans | Equity Plans As of March 4, 2021, 70 million shares of our common stock were available for future awards under our equity plans. Restricted Stock and Restricted Stock Units (“Restricted Stock Awards”) Restricted Stock Awards activity is summarized as follows:
| Quarter ended |  | Six months ended
| March 4, 2021 | February 27, 2020 |  | March 4, 2021 | February 27, 2020
Restricted stock award shares granted | — |  | — |  |  | 10 |  |  | 8 |  |
Weighted-average grant-date fair value per share | $ | 82.10 |  | $ | 54.71 |  |  | $ | 52.02 |  |  | $ | 46.38 |  |
Employee Stock Purchase Plan (“ESPP”) For each six-month ESPP period ended January 2021 and January 2020, we issued 2 million shares at a per share price of $42.55 and $38.16, respectively. Assumptions used in the Black-Scholes option valuation model for ESPP grants for the periods below were as follows:
Quarter ended | March 4, 2021 |  | February 27, 2020 |
Weighted-average grant-date fair value per share | $ | 22.40 |  | $ | 14.43 |
Average expected life in years | 0.5 |  | 0.5 |
Weighted-average expected volatility | 48 | % | 43 | %
Weighted-average risk-free interest rate | 0.1 | % | 1.5 | %
Expected dividend yield | 0 | % | 0 | %
Stock-based Compensation Expense Stock based compensation expense recognized in our statements of operations is presented below. Stock-based compensation expense of $33 million and $42 million was capitalized and remained in inventory as of March 4, 2021 and September 3, 2020, respectively.
| Quarter ended |  | Six months ended
| March 4, 2021 | February 27, 2020 |  | March 4, 2021 | February 27, 2020
Stock-based compensation expense by caption |  |  |  |  |
Cost of goods sold | $ | 57 |  | $ | 37 |  |  | $ | 98 |  | $ | 68 |
Research and development | 29 |  | 22 |  |  | 53 |  | 41 |
Selling, general, and administrative | 26 |  | 26 |  |  | 53 |  | 48 |
| $ | 112 |  | $ | 85 |  |  | $ | 204 |  | $ | 157 |
Stock-based compensation expense by type of award |  |  |  |  |
Restricted stock awards | $ | 94 |  | $ | 70 |  |  | $ | 171 |  | $ | 127 |
Employee stock purchase plan | 15 |  | 11 |  |  | 27 |  | 19 |
Stock options | 3 |  | 4 |  |  | 6 |  | 11 |
| $ | 112 |  | $ | 85 |  |  | $ | 204 |  | $ | 157 |
As of March 4, 2021, $838 million of total unrecognized compensation costs for unvested awards, before the effect of any future forfeitures, was expected to be recognized through the second quarter of 2025, resulting in a weighted-average period of 1.4 years.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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