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Stock-Based Compensation (Tables) | 9 Months Ended
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Jan. 29, 2016
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 nine months ended January 29, 2016 and January 23, 2015:
| Three months ended |  | Nine months ended
(in millions) | January 29, 2016 |  | January 23, 2015 |  | January 29, 2016 |  | January 23, 2015
Stock options | $ | 43 |  |  | $ | 7 |  |  | $ | 162 |  |  | $ | 27 |
Restricted stock awards | 33 |  |  | 24 |  |  | 113 |  |  | 78 |
Employee stock purchase plan | 5 |  |  | 2 |  |  | 15 |  |  | 10 |
Total stock-based compensation expense | $ | 81 |  |  | $ | 33 |  |  | $ | 290 |  |  | $ | 115 |
Cost of products sold | $ | 12 |  |  | $ | 4 |  |  | $ | 38 |  |  | $ | 12 |
Research and development expense | 8 |  |  | 5 |  |  | 28 |  |  | 20 |
Selling, general, and administrative expense | 47 |  |  | 24 |  |  | 162 |  |  | 83 |
Restructuring charges, net | 2 |  |  | — |  |  | 16 |  |  | — |
Acquisition-related items | 12 |  |  | — |  |  | 46 |  |  | — |
Total stock-based compensation expense | $ | 81 |  |  | $ | 33 |  |  | $ | 290 |  |  | $ | 115 |
Income tax benefits | (23 | ) |  | (8 | ) |  | (86 | ) |  | (31 | )
Total stock-based compensation expense, net of tax | $ | 58 |  |  | $ | 25 |  |  | $ | 204 |  |  | $ | 84 |

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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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