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Stock-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 25, 2015 | Apr. 30, 2016 | Apr. 25, 2015 | Apr. 26, 2014
Stock-Based Compensation |  |  |  |
Expense recognized |  | $ 9,647 | $ 11,377 | $ 14,475
Cash received for exercises of stock options |  | 420 | 1,397 | 3,565
Stock Options |  |  |  |
Stock-Based Compensation |  |  |  |
Cash received for exercises of stock options |  | $ 400 | $ 1,400 | 3,600
Number of Shares |  |  |  |
Outstanding, at beginning of period (in shares) | 1,039,000 | 1,039,000 |  |
Granted (in shares) | 426,539 | 427,000 |  |
Canceled (in shares) |  | (16,000) |  |
Exercised (in shares) |  | (39,000) |  |
Outstanding, at end of period (in shares) |  | 1,411,000 | 1,039,000 |
Exercisable (in shares) |  | 597,000 |  |
Weighted Average Exercise Price |  |  |  |
Outstanding, at beginning of period (in dollars per share) | $ 16.15 | $ 16.15 |  |
Granted (in dollars per share) |  | 26.69 |  |
Canceled (in dollars per share) |  | 25.71 |  |
Exercised (in dollars per share) |  | 10.75 |  |
Outstanding, at end of period (in dollars per share) |  | 19.39 | $ 16.15 |
Exercisable (in dollars per share) |  | $ 13.26 |  |
Additional information |  |  |  |
Weighted Average Remaining Contractual Term, Outstanding |  | 7 years 4 months 24 days | 7 years 7 months 6 days |
Weighted Average Remaining Contractual Term, Exercisable |  | 6 years |  |
Aggregate Intrinsic Value, Outstanding |  | $ 9,489 | $ 11,773 |
Aggregate Intrinsic Value, Exercised |  | 622 | $ 2,000 | $ 8,300
Aggregate Intrinsic Value, Exercisable |  | 7,529 |  |
Unrecognized compensation cost |  | $ 2,600 |  |
Period for recognition of unrecognized compensation costs |  | 1 year 9 months 18 days |  |
Vested during the period (in shares) |  | 300,000 |  |
Fair value assumptions |  |  |  |
Risk-free interest rate (as a percent) |  | 1.54% | 1.59% | 0.84%
Dividend rate (as a percent) |  | 1.20% | 1.00% | 0.84%
Expected life in years |  | 5 years | 5 years | 5 years
Stock price volatility (as a percent) |  | 44.37% | 54.40% | 81.27%
Fair value per share (in dollars per share) |  | $ 9.69 | $ 10.45 | $ 11.63
Stock Options | Minimum |  |  |  |
Stock-Based Compensation |  |  |  |
Purchase price of common stock at date of grant (as a percent) |  | 100.00% |  |
Vesting period |  | 1 year |  |
Stock Options | Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting period |  | 4 years |  |
Stock Options | Selling, General and Administrative Expense |  |  |  |
Stock-Based Compensation |  |  |  |
Expense recognized |  | $ 3,200 | $ 3,000 | $ 2,100
Stock Options | Former Long-Term Equity Award Plan | Minimum |  |  |  |
Stock-Based Compensation |  |  |  |
Award expiration term |  | 5 years |  |
Stock Options | Former Long-Term Equity Award Plan | Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Award expiration term |  | 10 years |  |

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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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