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Share-Based Compensation (Tables) | 6 Months Ended
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Jul. 28, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Allocation Of Stock-Based Compensation | Pre-tax share-based compensation was included in the Statements of Income as follows:
| Three Months Ended |  | Six Months Ended
(in thousands) | July 28, 2019 |  | July 29, 2018 |  | July 28, 2019 |  | July 29, 2018
Revenue offset | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 21,501 |
Cost of sales | 402 |  |  | 306 |  |  | 829 |  |  | 633 |
Selling, general and administrative | 6,082 |  |  | 11,378 |  |  | 14,426 |  |  | 22,840 |
Product development and engineering | 2,162 |  |  | 2,282 |  |  | 4,719 |  |  | 4,507 |
Total share-based compensation | $ | 8,646 |  |  | $ | 13,966 |  |  | $ | 19,974 |  |  | $ | 49,481 |
Schedule of Share-based Compensation, Restricted Stock Units | The following tables summarize the assumptions used in the Monte Carlo simulation model to determine the fair value of restricted stock units granted in fiscal year 2020 for both Tranche 1 and Tranche 2.
| Tranche 1 |  | Tranche 2
Expected life, in years | 1.0 |  |  | 2.1 |
Estimated volatility | 34.3 | % |  | 34.3 | %
Dividend yield | — | % |  | — | %
Risk-free interest rate | 2.5 | % |  | 2.5 | %
Weighted-average fair value on grant date | $ | 44.32 |  |  | $ | 33.19 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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