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Stock-Based Compensation - Performance Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Apr. 27, 2019 | Apr. 28, 2018 | Apr. 29, 2017
Stock-Based Compensation |  |  |
Equity based compensation expenses | $ 11,320 | $ 9,879 | $ 10,551
Performance Awards |  |  |
Stock-Based Compensation |  |  |
Percentage of payout dependent on financial performance | 80.00% |  |
Percentage of payout dependent on total shareholder return | 20.00% |  |
Performance Awards | Minimum |  |  |
Stock-Based Compensation |  |  |
Performance award opportunity as a percentage of target award | 50.00% |  |
Performance Awards | Maximum |  |  |
Stock-Based Compensation |  |  |
Performance award opportunity as a percentage of target award | 200.00% |  |
Performance awards, performance period | 3 years |  |
Performance-Based Shares |  |  |
Stock-Based Compensation |  |  |
Unrecognized compensation cost | $ 5,300 |  |
Period for recognition of unrecognized compensation costs | 1 year 4 months 24 days |  |
Equity based compensation expenses | $ 4,220 | $ 2,394 | 3,068
Number of Shares |  |  |
Non-vested at beginning of period (in shares) | 541 |  |
Granted (in shares) | 292 |  |
Vested (in shares) | (139) |  |
Canceled (in shares) | (171) |  |
Non-vested at end of period (in shares) | 523 | 541 |
Weighted Average Grant Date Fair Value |  |  |
Non-vested at beginning of period (in dollars per share) | $ 25.52 |  |
Granted (in dollars per share) | 31.71 |  |
Vested (in dollars per share) | 25.73 |  |
Canceled (in dollars per share) | 27.05 |  |
Non-vested at end of period (in dollars per share) | $ 28.43 | $ 25.52 |
Performance-Based Shares | Fiscal 2015 Grant |  |  |
Stock-Based Compensation |  |  |
Equity based compensation expenses |  |  | 675
Performance-Based Shares | Fiscal 2016 Grant |  |  |
Stock-Based Compensation |  |  |
Equity based compensation expenses |  | $ 1,052 | 1,284
Performance-Based Shares | Fiscal 2017 Grant |  |  |
Stock-Based Compensation |  |  |
Equity based compensation expenses | $ 1,044 | 455 | $ 1,109
Performance-Based Shares | Fiscal 2018 Grant |  |  |
Stock-Based Compensation |  |  |
Equity based compensation expenses | 1,402 | $ 887 |
Performance-Based Shares | Fiscal 2019 Grant |  |  |
Stock-Based Compensation |  |  |
Equity based compensation expenses | $ 1,774 |  |
Performance-Based Shares, vesting based on performance goals | Fiscal 2017 Grant |  |  |
Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per share) |  |  | $ 24.79
Performance-Based Shares, vesting based on performance goals | Fiscal 2018 Grant |  |  |
Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per share) |  | $ 25.93 |
Performance-Based Shares, vesting based on performance goals | Fiscal 2019 Grant |  |  |
Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per share) | $ 31.71 |  |
Performance Based Shares, vesting based on market conditions | Fiscal 2017 Grant |  |  |
Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per share) |  |  | $ 33.32
Performance Based Shares, vesting based on market conditions | Fiscal 2018 Grant |  |  |
Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per share) |  | $ 36.24 |
Performance Based Shares, vesting based on market conditions | Fiscal 2019 Grant |  |  |
Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per share) | $ 46.39 |  |

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- Definition The percentage of the payout for a performance share award that is based on the achievement of financial performance. + References No definition available. + Details
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- Definition The percentage of the payout for a performance share award that is based on the achievement of the total return that shareholders receive on their investment in the reporting entity's common stock relative to returns earned through investments in other public companies. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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