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Share-Based Compensation (Tables) | 3 Months Ended
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Apr. 28, 2019
Share-based Compensation [Abstract] |
Allocation Of Stock-Based Compensation | The following table summarizes pre-tax share-based compensation included in the Statements of Income for the three months ended April 28, 2019 and April 29, 2018.
| Three Months Ended
(in thousands) | April 28, 2019 |  | April 29, 2018
Revenue offset | $ | — |  |  | $ | 21,501 |
Cost of sales | 427 |  |  | 328 |
Selling, general and administrative | 8,344 |  |  | 11,462 |
Product development and engineering | 2,557 |  |  | 2,225 |
Share-based compensation | $ | 11,328 |  |  | $ | 35,516 |
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.
| April 28, 2019
| 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 the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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