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| | Fiscal Quarter Ended | |
| | February 2, | | | November 3, | | | February 3, | |
| | 2020 | | | 2019 | | | 2019 | |
Gross margin on GAAP basis | | $ | 3,264 | | | $ | 3,152 | | | $ | 3,208 | |
Purchase accounting effect on inventory | | | 11 | | | | — | | | | — | |
Amortization of acquisition-related intangible assets | | | 950 | | | | 827 | | | | 833 | |
Stock-based compensation expense | | | 43 | | | | 41 | | | | 34 | |
Restructuring charges | | | 8 | | | | 9 | | | | 56 | |
Acquisition-related costs | | | 1 | | | | 6 | | | | 2 | |
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Gross margin onnon-GAAP basis | | $ | 4,277 | | | $ | 4,035 | | | $ | 4,133 | |
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Research and development on GAAP basis | | $ | 1,289 | | | $ | 1,177 | | | $ | 1,133 | |
Stock-based compensation expense | | | 391 | | | | 394 | | | | 311 | |
Acquisition-related costs | | | 7 | | | | 1 | | | | 2 | |
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Research and development onnon-GAAP basis | | $ | 891 | | | $ | 782 | | | $ | 820 | |
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Selling, general and administrative expense on GAAP basis | | $ | 601 | | | $ | 409 | | | $ | 471 | |
Stock-based compensation expense | | | 111 | | | | 109 | | | | 120 | |
Acquisition-related costs | | | 175 | | | | 65 | | | | 90 | |
Litigation settlements | | | 13 | | | | — | | | | — | |
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Selling, general and administrative expense onnon-GAAP basis | | $ | 302 | | | $ | 235 | | | $ | 261 | |
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Total operating expenses on GAAP basis | | $ | 2,550 | | | $ | 2,098 | | | $ | 2,653 | |
Amortization of acquisition-related intangible assets | | | 603 | | | | 474 | | | | 476 | |
Stock-based compensation expense | | | 502 | | | | 503 | | | | 431 | |
Restructuring, impairment and disposal charges | | | 57 | | | | 38 | | | | 573 | |
Litigation settlements | | | 13 | | | | — | | | | — | |
Acquisition-related costs | | | 182 | | | | 66 | | | | 92 | |
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Total operating expenses onnon-GAAP basis | | $ | 1,193 | | | $ | 1,017 | | | $ | 1,081 | |
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Operating income on GAAP basis | | $ | 714 | | | $ | 1,054 | | | $ | 555 | |
Purchase accounting effect on inventory | | | 11 | | | | — | | | | — | |
Amortization of acquisition-related intangible assets | | | 1,553 | | | | 1,301 | | | | 1,309 | |
Stock-based compensation expense | | | 545 | | | | 544 | | | | 465 | |
Restructuring, impairment and disposal charges | | | 65 | | | | 47 | | | | 629 | |
Litigation settlements | | | 13 | | | | — | | | | — | |
Acquisition-related costs | | | 183 | | | | 72 | | | | 94 | |
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Operating income onnon-GAAP basis | | $ | 3,084 | | | $ | 3,018 | | | $ | 3,052 | |
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Interest expense on GAAP basis | | $ | (406 | ) | | $ | (361 | ) | | $ | (345 | ) |
Debt-related costs | | | 5 | | | | 26 | | | | — | |
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Interest expense onnon-GAAP basis | | $ | (401 | ) | | $ | (335 | ) | | $ | (345 | ) |
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Other income (expense), net on GAAP basis | | $ | (4 | ) | | $ | 54 | | | $ | 68 | |
(Gains) losses on investments | | | 18 | | | | (50 | ) | | | (27 | ) |
Acquisition-related -non-operating contract fair value adjustment amortization | | | (4 | ) | | | — | | | | — | |
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Other income, net onnon-GAAP basis | | $ | 10 | | | $ | 4 | | | $ | 41 | |
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Income from continuing operations before income taxes on GAAP basis | | $ | 304 | | | $ | 747 | | | $ | 278 | |
Purchase accounting effect on inventory | | | 11 | | | | — | | | | — | |
Amortization of acquisition-related intangible assets | | | 1,553 | | | | 1,301 | | | | 1,309 | |
Stock-based compensation expense | | | 545 | | | | 544 | | | | 465 | |
Restructuring, impairment and disposal charges | | | 65 | | | | 47 | | | | 629 | |
Litigation settlements | | | 13 | | | | — | | | | — | |
Acquisition-related costs, net | | | 179 | | | | 72 | | | | 94 | |
Debt-related costs | | | 5 | | | | 26 | | | | — | |
(Gains) losses on investments | | | 18 | | | | (50 | ) | | | (27 | ) |
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Income before income taxes onnon-GAAP basis | | $ | 2,693 | | | $ | 2,687 | | | $ | 2,748 | |
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Benefit from income taxes on GAAP basis | | $ | (76 | ) | | $ | (100 | ) | | $ | (203 | ) |
Non-GAAP tax reconciling adjustments | | | 399 | | | | 396 | | | | 505 | |
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Provision for income taxes onnon-GAAP basis | | $ | 323 | | | $ | 296 | | | $ | 302 | |
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Net income on GAAP basis | | $ | 385 | | | $ | 847 | | | $ | 471 | |
Purchase accounting effect on inventory | | | 11 | | | | — | | | | — | |
Amortization of acquisition-related intangible assets | | | 1,553 | | | | 1,301 | | | | 1,309 | |
Stock-based compensation expense | | | 545 | | | | 544 | | | | 465 | |
Restructuring, impairment and disposal charges | | | 65 | | | | 47 | | | | 629 | |
Litigation settlements | | | 13 | | | | — | | | | — | |
Acquisition-related costs, net | | | 179 | | | | 72 | | | | 94 | |
Debt-related costs | | | 5 | | | | 26 | | | | — | |
(Gains) losses on investments | | | 18 | | | | (50 | ) | | | (27 | ) |
Non-GAAP tax reconciling adjustments | | | (399 | ) | | | (396 | ) | | | (505 | ) |
Discontinued operations, net of income taxes | | | (5 | ) | | | — | | | | 10 | |
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Net income onnon-GAAP basis | | $ | 2,370 | | | $ | 2,391 | | | $ | 2,446 | |
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Weighted-average shares used in per share calculations - diluted on GAAP basis | | | 420 | | | | 416 | | | | 419 | |
Non-GAAP adjustment(1) | | | 31 | | | | 28 | | | | 22 | |
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Weighted-average shares used in per share calculations - diluted onnon-GAAP basis | | | 451 | | | | 444 | | | | 441 | |
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Net income onnon-GAAP basis | | $ | 2,370 | | | $ | 2,391 | | | $ | 2,446 | |
Interest expense onnon-GAAP basis | | | 401 | | | | 335 | | | | 345 | |
Provision for income taxes onnon-GAAP basis | | | 323 | | | | 296 | | | | 302 | |
Depreciation | | | 146 | | | | 143 | | | | 143 | |
Amortization onnon-GAAP basis | | | 25 | | | | — | | | | — | |
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Adjusted EBITDA | | $ | 3,265 | | | $ | 3,165 | | | $ | 3,236 | |
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Net cash provided by operating activities | | $ | 2,322 | | | $ | 2,479 | | | $ | 2,132 | |
Purchases of property, plant and equipment | | | (108 | ) | | | (96 | ) | | | (99 | ) |
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Free cash flow | | $ | 2,214 | | | $ | 2,383 | | | $ | 2,033 | |
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