Represents percentages of share based payment award that vests each year from the date of grant.

No definition available.

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- Definition

Period from date of grant for first vesting of the award.

+ References

No definition available.

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- Definition

For share-based compensation awards, this represents the common share equivalent per award share or unit.

+ References

No definition available.

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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
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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i)
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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

No definition available.

+ 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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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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
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-Paragraph 2
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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
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
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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
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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
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-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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- Definition

Per share weighted average intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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
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-Paragraph 2
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ 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
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-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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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
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-SubTopic 10
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-Subparagraph (c)(2)(iii)(2)
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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
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-SubTopic 10
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-Subparagraph (c)(2)(iii)(2)
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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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