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Stock-Based Compensation - Restricted Stock and RSUs (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Stock-Based Compensation |  |  |
Expense recognized | $ 9,879 | $ 10,551 | $ 9,647
Restricted Stock | Employees |  |  |
Stock-Based Compensation |  |  |
Percentage vesting each year from date of grant | 25.00% |  |
Period from grant date for first vesting | 1 year |  |
Vesting period | 4 years |  |
Unrecognized compensation cost | $ 4,400 |  |
Period for recognition of unrecognized compensation costs | 2 years 6 months |  |
Number of Shares |  |  |
Non-vested at beginning of period (in shares) | 209,000 |  |
Granted (in shares) | 107,662 |  |
Vested (in shares) | (69,000) |  |
Canceled (in shares) | (15,000) |  |
Non-vested at end of period (in shares) | 233,000 | 209,000 |
Weighted Average Grant Date Fair Value |  |  |
Non-vested at beginning of period (in dollars per share) | $ 25.72 |  |
Granted (in dollars per share/unit) | 27.45 |  |
Vested (in dollars per share) | 25.44 |  |
Canceled (in dollars per share) | 26.36 |  |
Non-vested at end of period (in dollars per share) | 26.56 | $ 25.72 |
Restricted Stock | Non-Employee Directors |  |  |
Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per share/unit) | $ 23.85 | $ 27.10 | $ 27.74
Restricted Stock | Non-Employee Directors | Maximum |  |  |
Number of Shares |  |  |
Granted (in shares) | 100,000 | 100,000 | 100,000
Restricted Stock | Selling, general and administrative expense | Employees |  |  |
Stock-Based Compensation |  |  |
Expense recognized | $ 2,200 | $ 1,700 | $ 1,100
Restricted Stock | Selling, general and administrative expense | Non-Employee Directors |  |  |
Stock-Based Compensation |  |  |
Expense recognized | $ 700 | $ 600 | 600
Restricted Stock Units | Employees |  |  |
Stock-Based Compensation |  |  |
Percentage vesting each year from date of grant | 25.00% |  |
Period from grant date for first vesting | 1 year |  |
Vesting period | 4 years |  |
Unrecognized compensation cost | $ 0 |  |
Number of Shares |  |  |
Non-vested at beginning of period (in shares) | 23,000 |  |
Vested (in shares) | (23,000) |  |
Non-vested at end of period (in shares) | 0 | 23,000 |
Weighted Average Grant Date Fair Value |  |  |
Non-vested at beginning of period (in dollars per share) | $ 19.80 |  |
Vested (in dollars per share) | $ 19.80 |  |
Non-vested at end of period (in dollars per share) |  | $ 19.80 |
Restricted Stock Units | Selling, general and administrative expense | Employees |  |  |
Stock-Based Compensation |  |  |
Expense recognized | $ 900 | $ 800 | $ 1,400

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: 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 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 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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