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Stock-Based Awards | 3 Months Ended
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Apr. 28, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Awards | Stock-Based Awards The Company has certain stock-based compensation plans under which it grants stock-based awards, including common stock, stock options, restricted share units, and performance-based restricted share units (“Performance RSUs”) to attract, retain, and reward talented employees, officers, and directors, and to align the interests of employees, officers, and directors with those of the stockholders. Compensation expense for stock-based awards is based on fair value at the measurement date. It fluctuates over time as a function of the duration of vesting periods of the stock-based awards and the Company’s performance, as measured by criteria set forth in performance-based awards. This expense is included in general and administrative expenses in the condensed consolidated statements of operations and the amount of expense ultimately recognized depends on the quantity of awards that actually vest. Accordingly, stock-based compensation expense may vary from period to period. The performance criteria for the Company’s performance-based equity awards utilize the Company’s operating earnings (adjusted for certain amounts) as a percentage of contract revenues for the applicable four-quarter period (a “Performance Year”) and its Performance Year operating cash flow level (adjusted for certain amounts). Additionally, certain awards include three-year performance goals that, if met, result in supplemental shares awarded. For Performance RSUs, the Company evaluates compensation expense quarterly and recognizes expense for performance-based awards only if it determines it is probable that performance criteria for the awards will be met. Stock-based compensation expense and the related tax benefit recognized and realized during the three months ended April 28, 2018 and April 29, 2017 were as follows (dollars in thousands):
| For the Three Months Ended
| April 28, 2018 |  | April 29, 2017
Stock-based compensation | $ | 4,863 |  |  | $ | 4,915 |
Income tax effect of stock-based compensation | $ | 1,069 |  |  | $ | 1,943 |
As of April 28, 2018, the Company had unrecognized compensation expense related to stock options, RSUs, and target Performance RSUs (based on the Company’s estimate of performance goal achievement) of $3.8 million, $11.5 million, and $31.9 million, respectively. This expense will be recognized over a weighted-average number of years of 2.6, 2.8, and 2.5, respectively, based on the average remaining service periods for the awards. As of April 28, 2018, the Company may recognize an additional $13.4 million in compensation expense in future periods if the maximum amount of Performance RSUs is earned based on certain performance measures being met. Stock Options The following table summarizes stock option award activity during the three months ended April 28, 2018:
| Stock Options
| Shares |  | Weighted Average Exercise Price
Outstanding as of January 27, 2018 | 636,730 |  |  | $ | 27.93 |
Granted | 28,796 |  |  | $ | 106.19 |
Options exercised | (5,084 | ) |  | $ | 13.15 |
Canceled | — |  |  | $ | — |
Outstanding as of April 28, 2018 | 660,442 |  |  | $ | 31.46 |
Exercisable options as of April 28, 2018 | 544,423 |  |  | $ | 21.71 |
RSUs and Performance RSUs The following table summarizes RSU and Performance RSU award activity during the three months ended April 28, 2018:
| Restricted Stock
| RSUs |  | Performance RSUs
| Share Units |  | Weighted Average Grant Price |  | Share Units |  | Weighted Average Grant Price
Outstanding as of January 27, 2018 | 133,896 |  |  | $ | 71.81 |  |  | 390,327 |  |  | $ | 80.52 |
Granted | 39,612 |  |  | $ | 106.36 |  |  | 218,628 |  |  | $ | 106.19 |
Share units vested | (3,099 | ) |  | $ | 76.98 |  |  | — |  |  | $ | — |
Forfeited or canceled | (3,299 | ) |  | $ | 59.10 |  |  | (10,437 | ) |  | $ | 81.55 |
Outstanding as of April 28, 2018 | 167,110 |  |  | $ | 80.16 |  |  | 598,518 |  |  | $ | 89.88 |
The total amount of granted Performance RSUs presented above consists of 158,841 target shares and 59,787 supplemental shares. The total amount of Performance RSUs outstanding as of April 28, 2018 consists of 431,118 target shares and 167,400 supplemental shares.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 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) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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