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Stock-Based Compensation (Tables) | 6 Months Ended
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Oct. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Components and Classification of Stock-based Compensation Expense | The following table presents the components and classification of stock-based compensation expense recognized for the three and six months ended October 30, 2015 and October 24, 2014:
| Three months ended |  | Six months ended
(in millions) | October 30, 2015 |  | October 24, 2014 |  | October 30, 2015 |  | October 24, 2014
Stock options | $ | 62 |  |  | $ | 14 |  |  | $ | 119 |  |  | $ | 20 |
Restricted stock awards | 46 |  |  | 31 |  |  | 80 |  |  | 54 |
Employee stock purchase plan | 5 |  |  | 3 |  |  | 10 |  |  | 8 |
Total stock-based compensation expense | $ | 113 |  |  | $ | 48 |  |  | $ | 209 |  |  | $ | 82 |
Cost of products sold | $ | 14 |  |  | $ | 4 |  |  | $ | 26 |  |  | $ | 8 |
Research and development expense | 12 |  |  | 9 |  |  | 20 |  |  | 15 |
Selling, general, and administrative expense | 65 |  |  | 35 |  |  | 114 |  |  | 59 |
Restructuring charges, net | 6 |  |  | — |  |  | 14 |  |  | — |
Acquisition-related items | 16 |  |  | — |  |  | 35 |  |  | — |
Total stock-based compensation expense | $ | 113 |  |  | $ | 48 |  |  | $ | 209 |  |  | $ | 82 |
Income tax benefits | (34 | ) |  | (14 | ) |  | (63 | ) |  | (23 | )
Total stock-based compensation expense, net of tax | $ | 79 |  |  | $ | 34 |  |  | $ | 146 |  |  | $ | 59 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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