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Stock-Based Awards (Tables) | 12 Months Ended
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Jul. 29, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock-based Compensation Expense and Related Tax Benefit Recognized | Stock-based compensation expense and the related tax benefit recognized and realized during fiscal 2017, 2016, and 2015 were as follows (dollars in thousands):
| Fiscal Year Ended
| 2017 |  | 2016 |  | 2015
Stock-based compensation | $ | 20,805 |  |  | $ | 16,850 |  |  | $ | 13,923 |
Related tax benefit for stock-based compensation | $ | 7,996 |  |  | $ | 6,436 |  |  | $ | 5,458 |
Cash tax benefit realized from option exercises and stock vestings | $ | 14,487 |  |  | $ | 18,097 |  |  | $ | 13,976 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The following table summarizes the valuation of stock options and restricted share units granted during fiscal 2017, 2016, and 2015 and the significant valuation assumptions:
| Fiscal Year Ended
| 2017 |  | 2016 |  | 2015
Weighted average fair value of RSUs granted | $ | 79.04 |  |  | $ | 72.41 |  |  | $ | 31.42 |
Weighted average fair value of Performance RSUs granted | $ | 79.29 |  |  | $ | 77.86 |  |  | $ | 31.03 |
Weighted average fair value of stock options granted | $ | 78.46 |  |  | $ | 78.20 |  |  | $ | 19.48 |
Stock option assumptions: |  |  |  |  |
Risk-free interest rate | 2.3 | % |  | 2.0 | % |  | 2.1 | %
Expected life (in years) | 7.6 |  |  | 7.3 |  |  | 8.8 |
Expected volatility | 44.7 | % |  | 55.0 | % |  | 54.5 | %
Expected dividends | — |  |  | — |  |  | — |
Schedule of Share-based Compensation, Stock Options Award Activity | The following table summarizes stock option award activity during fiscal 2017:
| Stock Options
| Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (In years) |  | Aggregate Intrinsic Value (In thousands)
Outstanding as of July 30, 2016 | 737,267 |  |  | $ | 20.99 |  |  |  |  |
Granted | 36,914 |  |  | $ | 78.46 |  |  |  |  |
Options exercised | (102,831 | ) |  | $ | 14.09 |  |  |  |  |
Canceled | (1,000 | ) |  | $ | 6.83 |  |  |  |  |
Outstanding as of July 29, 2017 | 670,350 |  |  | $ | 25.24 |  |  | 4.9 |  | $ | 43,614 |
Exercisable options as of July 29, 2017 | 539,378 |  |  | $ | 18.34 |  |  | 4.2 |  | $ | 38,812 |
Schedule of Share-based Compensation, RSU and Performance RSU Activity | The following table summarizes RSU and Performance RSU award activity during fiscal 2017:
| Restricted Stock
| RSUs |  | Performance RSUs
| Share Units |  | Weighted Average Grant Price |  | Share Units |  | Weighted Average Grant Price
Outstanding as of July 30, 2016 | 251,264 |  |  | $ | 42.56 |  |  | 625,971 |  |  | $ | 47.66 |
Granted | 66,382 |  |  | $ | 79.04 |  |  | 274,282 |  |  | $ | 79.29 |
Share units vested | (126,186 | ) |  | $ | 34.65 |  |  | (287,593 | ) |  | $ | 40.53 |
Forfeited or canceled | (3,995 | ) |  | $ | 46.87 |  |  | (58,778 | ) |  | $ | 43.52 |
Outstanding as of July 29, 2017 | 187,465 |  |  | $ | 60.71 |  |  | 553,882 |  |  | $ | 67.46 |

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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