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Shareholders' Equity and Share-Based Compensation (Tables) | 12 Months Ended
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Apr. 28, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Nonvested Restricted Stock and Restricted Stock Units Activity | A summary of nonvested restricted stock and restricted stock units for fiscal years 2018, 2017, and 2016 is as follows:
| Year Ended
| April 28, 2018 |  | April 29, 2017 |  | April 30, 2016
| Number of Nonvested Shares |  | Weighted Average Grant Date Fair Value Per Share |  | Number of Nonvested Shares |  | Weighted Average Grant Date Fair Value Per Share |  | Number of Nonvested Shares |  | Weighted Average Grant Date Fair Value Per Share
Outstanding at beginning of year | 402 |  |  | $ | 8.69 |  |  | 384 |  |  | $ | 9.10 |  |  | 344 |  |  | $ | 10.63 |
Granted | 178 |  |  | 8.46 |  |  | 157 |  |  | 8.00 |  |  | 159 |  |  | 7.04 |
Vested | (141 | ) |  | 9.06 |  |  | (134 | ) |  | 9.03 |  |  | (110 | ) |  | 10.76 |
Forfeited | (2 | ) |  | 8.93 |  |  | (5 | ) |  | 8.98 |  |  | (9 | ) |  | 10.69 |
Outstanding at end of year | 437 |  |  | $ | 8.48 |  |  | 402 |  |  | $ | 8.69 |  |  | 384 |  |  | $ | 9.10 |
Schedule of Stock Option Award Activity | A summary of stock option activity under all stock option plans during the fiscal year ended April 28, 2018 is as follows:
| Stock Options |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding at April 29, 2017 | 2,481 |  |  | $ | 11.15 |  |  | 4.53 |  |  | $ | 768 |
Granted | 169 |  |  | 9.63 |  |  | — |  |  | — |
Canceled or forfeited | (287 | ) |  | 19.78 |  |  | — |  |  | — |
Exercised | (58 | ) |  | 8.91 |  |  | — |  |  | 65 |
Outstanding at April 28, 2018 | 2,305 |  |  | $ | 10.02 |  |  | 4.51 |  |  | $ | 356 |
Shares vested and expected to vest | 2,282 |  |  | $ | 10.02 |  |  | 4.47 |  |  | $ | 354 |
Exercisable at April 28, 2018 | 1,788 |  |  | $ | 10.04 |  |  | 3.50 |  |  | $ | 304 |
Schedule of Weighted-Average Assumptions | The following table provides the weighted-average fair value of options granted and the related assumptions used in the Black-Scholes model:
| Year Ended
| April 28, 2018 |  | April 29, 2017 |  | April 30, 2016
Fair value of options granted | $ | 2.82 |  |  | $ | 2.93 |  |  | $ | 2.92 |
Risk-free interest rate | 1.95 | % |  | 1.31 - 1.44% |  |  | 1.70 - 1.90% |
Expected dividend rate | 3.27 | % |  | 3.15 | % |  | 2.78 | %
Expected volatility | 42.51% |  |  | 44.12 - 44.51% |  |  | 42.71 - 48.32% |
Expected life of option | 6.83 years |  |  | 5.78 - 6.98 years |  |  | 5.78 - 6.98 years |
Schedule of Share-Based Compensation Expense by Award Type | The following table presents a summary of the share-based compensation expense by equity type as follows:
| Year Ended
| April 28, 2018 |  | April 29, 2017 |  | April 30, 2016
Stock options | $ | 763 |  |  | $ | 1,072 |  |  | $ | 1,179 |
Restricted stock and stock units | 1,442 |  |  | 1,287 |  |  | 1,237 |
Employee stock purchase plans | 430 |  |  | 555 |  |  | 542 |
| $ | 2,635 |  |  | $ | 2,914 |  |  | $ | 2,958 |
Schedule of Share-Based Compensation Expense | A summary of the share-based compensation expenses for stock options, restricted stock, restricted stock units and shares issued under the ESPP for fiscal years 2018, 2017, and 2016 is as follows:
| Year Ended
| April 28, 2018 |  | April 29, 2017 |  | April 30, 2016
Cost of sales | $ | 619 |  |  | $ | 714 |  |  | $ | 751 |
Selling | 644 |  |  | 723 |  |  | 780 |
General and administrative | 851 |  |  | 877 |  |  | 839 |
Product design and development | 521 |  |  | 600 |  |  | 588 |
| $ | 2,635 |  |  | $ | 2,914 |  |  | $ | 2,958 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 + Details
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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 for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -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 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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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- 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=96867065&loc=d3e5070-113901 + Details
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