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Shareholders' Equity - Summary of Restricted Stock Awards and Restricted Stock Units Activity (Details) - 2014 Incentive Plan - $ / shares	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
RSUs
Shares
Unvested and unissued - beginning balance (in shares)	382,372	568,000	576,000
Awarded (in shares)	7,750	30,925	32,000
Vested (in shares)	(152,328)	(160,553)	(11,333)
Forfeited and cancelled (in shares)	(49,950)	(56,000)	(28,667)
Unvested and unissued - ending balance (in shares)	187,844	382,372	568,000
Wtd. Avg. Grant Date Fair Value
Weighted average value - beginning balance (in dollars per share)	$ 33.87	$ 33.45	$ 33.39
Weighted average value, awarded (in dollars per share)	38.75	41.82	34.90
Weighted average value, vested (in dollars per share)	33.75	33.72	33.78
Weighted average value, forfeited (in dollars per share)	32.42	34.42	33.78
Weighted average value - ending balance (in dollars per share)	34.55	33.87	33.45
Executives and non-executive members of management | RSAs
Wtd. Avg. Grant Date Fair Value
Weighted average value - beginning balance (in dollars per share)	34.13	33.42	33.35
Weighted average value, awarded (in dollars per share)	38.75	40.92	34.90
Weighted average value, vested (in dollars per share)	0.00	0.00	0.00
Weighted average value, forfeited (in dollars per share)	34.79	34.42	33.78
Weighted average value - ending balance (in dollars per share)	$ 34.09	$ 34.13	$ 33.42
Executives and non-executive members of management | 2020 EBITDA Maximum Performance | RSAs
Shares
Unvested and unissued - beginning balance (in shares)	1,171,238	1,168,500	1,161,000
Awarded (in shares)	11,625	128,738	72,000
Vested (in shares)	0	0	0
Forfeited and cancelled (in shares)	(151,455)	(126,000)	(64,500)
Unvested and unissued - ending balance (in shares)	1,031,408	1,171,238	1,168,500

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
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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.

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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).

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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).

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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.

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

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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