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Stock-Based Compensation - Restricted Shares and RSUs (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 30, 2016 | Apr. 29, 2017 | Apr. 30, 2016 | Apr. 25, 2015
Stock-Based Compensation |  |  |  |
Expense recognized |  | $ 10,551 | $ 9,647 | $ 11,377
Restricted Stock |  |  |  |
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 |  | $ 4,000 |  |
Period for recognition of unrecognized compensation costs |  | 2 years 7 months 6 days |  |
Number of Shares |  |  |  |
Non-vested at beginning of period (in shares) | 169,000 | 169,000 |  |
Granted (in shares) |  | 102,000 |  |
Vested (in shares) |  | (51,000) |  |
Canceled (in shares) |  | (11,000) |  |
Non-vested at end of period (in shares) |  | 209,000 | 169,000 |
Weighted Average Grant Date Fair Value |  |  |  |
Non-vested at beginning of period (in dollars per share) | $ 25.22 | $ 25.22 |  |
Granted (in dollars per share/unit) | $ 25.99 | 26.20 |  |
Vested (in dollars per share) |  | 25.06 |  |
Canceled (in dollars per share) |  | 25.56 |  |
Non-vested at end of period (in dollars per share) |  | $ 25.72 | $ 25.22 |
Restricted Stock | Employees |  |  |  |
Number of Shares |  |  |  |
Granted (in shares) |  | 97,924 |  |
Restricted Stock | Selling, General and Administrative Expense |  |  |  |
Stock-Based Compensation |  |  |  |
Expense recognized |  | $ 1,700 | $ 1,100 | $ 800
Restricted Stock Units | Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Fair value (in dollars per unit) |  | $ 27.90 |  |
Award common share equivalent (in shares) |  | 1 |  |
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 |  | $ 100 |  |
Number of Shares |  |  |  |
Non-vested at beginning of period (in shares) | 77,000 | 77,000 |  |
Vested (in shares) |  | (51,000) |  |
Canceled (in shares) |  | (3,000) |  |
Non-vested at end of period (in shares) |  | 23,000 | 77,000 |
Weighted Average Grant Date Fair Value |  |  |  |
Non-vested at beginning of period (in dollars per share) | $ 16.61 | $ 16.61 |  |
Vested (in dollars per share) |  | 15.47 |  |
Canceled (in dollars per share) |  | 16.62 |  |
Non-vested at end of period (in dollars per share) |  | $ 19.80 | $ 16.61 |
Restricted Stock Units | Employees | Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Period for recognition of unrecognized compensation costs |  | 1 year |  |
Restricted Stock Units | Non-Employee Directors |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |
Granted (in dollars per share/unit) |  | $ 27.10 | $ 27.74 | $ 21.81
Restricted Stock Units | Non-Employee Directors | Maximum |  |  |  |
Number of Shares |  |  |  |
Granted (in shares) |  | 100,000 | 100,000 | 100,000
Restricted Stock Units | Selling, General and Administrative Expense | Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Expense recognized |  | $ 800 | $ 1,400 | $ 1,500
Restricted Stock Units | Selling, General and Administrative Expense | Non-Employee Directors |  |  |  |
Stock-Based Compensation |  |  |  |
Expense recognized |  | $ 600 | $ 600 | $ 700

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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=6415400&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=6415400&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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Per share weighted average intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options. + 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=6415400&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=6415400&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://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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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