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Equity Plans | 6 Months Ended
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Feb. 27, 2020
Share-based Payment Arrangement [Abstract] |
Equity Plans | Equity Plans As of February 27, 2020, 92 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 Award activity is summarized as follows:
| Quarter ended |  |  | Six months ended |
| February 27, 2020 | February 28, 2019 |  | February 27, 2020 | February 28, 2019
Restricted stock award shares granted | — | — |  | 8 | 6
Weighted-average grant-date fair value per share | $ | 54.71 |  | $ | 37.01 |  |  | $ | 46.38 |  | $ | 39.83 |
Employee Stock Purchase Plan (“ESPP”) For the six-month ESPP period ended January 2020 and January 2019, we issued 2 million and 1 million shares, respectively, at a per share price of $38.16 and $32.50, respectively. Assumptions used in the Black-Scholes option valuation model for ESPP grants for the periods below were as follows:
Quarter ended | February 27, 2020 | February 28, 2019
Weighted-average grant-date fair value per share | 14.43 |  | 10.92 |
Average expected life in years | 0.5 | 0.5
Weighted-average expected volatility | 43 | % | 47 | %
Weighted-average risk-free interest rate | 1.5 | % | 2.5 | %
Expected dividend yield | 0 | % | 0 | %
Stock-based Compensation Expense
| Quarter ended |  |  | Six months ended |
| February 27, 2020 | February 28, 2019 |  | February 27, 2020 | February 28, 2019
Stock-based compensation expense by caption |  |  |  |  |
Cost of goods sold | $ | 37 |  | $ | 23 |  |  | $ | 68 |  | $ | 49 |
Selling, general, and administrative | 26 |  | 18 |  |  | 48 |  | 37 |
Research and development | 22 |  | 16 |  |  | 41 |  | 32 |
| $ | 85 |  | $ | 57 |  |  | $ | 157 |  | $ | 118 |
Stock-based compensation expense by type of award |  |  |  |  |
Restricted stock awards | $ | 70 |  | $ | 42 |  |  | $ | 127 |  | $ | 83 |
ESPP | 11 |  | 8 |  |  | 19 |  | 16 |
Stock options | 4 |  | 7 |  |  | 11 |  | 19 |
| $ | 85 |  | $ | 57 |  |  | $ | 157 |  | $ | 118 |
The income tax benefits related to share-based compensation were $53 million and $79 million for the second quarter and first six months of 2020, respectively, and $30 million and $53 million for the second quarter and first six months of 2019, respectively. As of February 27, 2020, $656 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 2024, 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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