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Equity Plans | 3 Months Ended
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Dec. 04, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Equity Plans | Equity Plans As of December 4, 2014, our equity plans permit us to issue an aggregate of up to 154 million shares of common stock, of which 95 million shares were available for future awards. Awards are subject to terms and conditions as determined by our Board of Directors. Stock Options Stock options granted and assumptions used in the Black-Scholes option valuation model are presented below:
Quarter Ended |  | December 4, 2014 |  | November 28, 2013
Stock options granted |  | 1 |  |  | 2 |
Weighted-average grant-date fair value per share |  | $13.20 |  | $7.58
Average expected life in years |  | 5.7 |  |  | 4.8 |
Weighted-average expected volatility |  | 47 | % |  | 50 | %
Weighted-average risk-free interest rate |  | 1.6 | % |  | 1.3 | %
The expected volatilities utilized were based on implied volatilities from traded options on our stock and on our historical volatility. The expected lives of options granted were based, in part, on historical experience and on the terms and conditions of the options. The risk-free interest rates utilized were based on the U.S. Treasury yield in effect at each grant date. No dividends were assumed in estimated option values. Restricted Stock and Restricted Stock Units ("Restricted Stock Awards") As of December 4, 2014, there were 13 million shares of Restricted Stock Awards outstanding, of which 1 million were performance-based or market-based Restricted Stock Awards. For service-based Restricted Stock Awards, restrictions generally lapse in one-fourth increments during each year of employment after the grant date. Vesting for performance-based awards is contingent upon meeting a specified return on assets ("ROA"), as defined, over a three-year performance period and vesting for market-based Restricted Stock Awards is contingent upon total shareholder return ("TSR") relative to the companies included in the S&P 500 over a three-year performance period. At the end of the performance period, the number of actual shares to be awarded varies between 0% and 200% of target amounts, depending upon the achievement level of the specified ROA or TSR. Restricted Stock Awards activity for the first quarters of 2015 and 2014 are summarized as follows:
Quarter Ended |  | December 4, 2014 |  | November 28, 2013
Restricted stock awards granted |  | 2 |  |  | 2 |
Weighted-average grant-date fair values per share |  | $ | 30.17 |  |  | $ | 17.31 |
Stock-based Compensation Expense
Quarter Ended |  | December 4, 2014 |  | November 28, 2013
Stock-based compensation expense by caption: |  |  |  |
Cost of goods sold |  | $ | 12 |  |  | $ | 7 |
Selling, general and administrative |  | 15 |  |  | 11 |
Research and development |  | 8 |  |  | 4 |
|  | $ | 35 |  |  | $ | 22 |
Stock-based compensation expense by type of award: |  |  |  |
Stock options |  | $ | 18 |  |  | $ | 14 |
Restricted stock awards |  | 17 |  |  | 8 |
|  | $ | 35 |  |  | $ | 22 |
As of December 4, 2014, $305 million of total unrecognized compensation costs, net of estimated forfeitures, related to non-vested awards was expected to be recognized through the first quarter of 2019, resulting in a weighted-average period of 1.4 years. Stock-based compensation expense in the above presentation does not reflect any significant income tax benefits, which is consistent with our treatment of income or loss from our U.S. operations.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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