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Shareholders' Equity - Summary of Restricted Stock Awards and Restricted Stock Units Activity (Details) - 2014 Incentive Plan - $ / shares	12 Months Ended
	May 02, 2020	Apr. 27, 2019	Apr. 28, 2018
RSAs
Shares
Vested (in shares)	(444,500)
RSUs
Shares
Non-vested beginning balance (in shares)	187,844	382,372	568,000
Awarded (in shares)	0	7,750	30,925
Vested (in shares)	(176,994)	(152,328)	(160,553)
Forfeited and cancelled (in shares)	(7,750)	(49,950)	(56,000)
Non-vested ending balance (in shares)	3,100	187,844	382,372
Wtd. Avg. Grant Date Fair Value
Weighted average value - beginning balance (in dollars per share)	$ 34.55	$ 33.87	$ 33.45
Weighted average value, awarded (in dollars per share)	0	38.75	41.82
Weighted average value, vested (in dollars per share)	34.25	33.75	33.72
Weighted average value, forfeited (in dollars per share)	38.75	32.42	34.42
Weighted average value - ending balance (in dollars per share)	41.20	34.55	33.87
Executives and non-executive members of management | RSAs
Wtd. Avg. Grant Date Fair Value
Weighted average value - beginning balance (in dollars per share)	34.09	34.13	33.42
Weighted average value, awarded (in dollars per share)	0	38.75	40.92
Weighted average value, vested (in dollars per share)	33.89	0	0
Weighted average value, forfeited (in dollars per share)	34.25	34.79	34.42
Weighted average value - ending balance (in dollars per share)	$ 0	$ 34.09	$ 34.13
Executives and non-executive members of management | 2020 EBITDA Maximum Performance | RSAs
Shares
Non-vested beginning balance (in shares)	1,031,408	1,171,238	1,168,500
Awarded (in shares)	0	11,625	128,738
Vested (in shares)	(455,750)	0	0
Forfeited and cancelled (in shares)	(575,658)	(151,455)	(126,000)
Non-vested ending balance (in shares)	0	1,031,408	1,171,238

X

- Definition

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

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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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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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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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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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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