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- Definition

Allocated Share-based Compensation Expense, Amount Recorded to True-up Prior Periods, Per Share Impact

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- Definition

Multiplier - Maximum Performance

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- Definition

Multiplier - Target Performance

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Multiplier - Threshold Performance

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Award Annual Vesting Percentage

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, EBITDA Goal

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, EBITDA Goal, Percentage of Likelihood

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Total Aggregate Grants Under the Plan

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Remaining for Award

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The total compensation expense to be recorded over the vesting period.

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Shared-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance-based Shares to be Issued

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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.

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Face amount or stated value per share of common stock.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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.

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- Definition

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

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- Definition

Market valuation of entity divided by earnings before interest, taxes, depreciation, and amortization (EBITDA), used as an input to measure fair value.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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

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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.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Gross number of share options (or share units) granted during the period.

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No definition available.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of share instruments newly issued under a share-based compensation plan.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Shareholders' Equity - Narrative (Details)	3 Months Ended				12 Months Ended
Shareholders' Equity - Narrative (Details)	Apr. 28, 2018 USD ($) shares $ / shares	Jan. 27, 2018 USD ($)	Oct. 28, 2017 USD ($)	Jul. 29, 2017 USD ($)	Apr. 28, 2018 USD ($) shares $ / shares	Apr. 29, 2017 USD ($) $ / shares shares	Apr. 30, 2016 USD ($) shares	Apr. 28, 2012 shares	May 01, 2011 shares	May 02, 2015 shares	Apr. 30, 2007 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount \| $	$ 100,000,000				$ 100,000,000
Purchase of common stock (in shares)					0	280,168	1,997,298
Purchase of common stock \| $						$ 9,800,000	$ 62,300,000
Dividends paid \| $					$ 14,700,000	13,700,000	13,500,000
Compensation expense \| $					$ 4,000,000	$ 12,400,000	7,400,000
Common stock - par value per share (in dollars per share) \| $ / shares	$ 0.50				$ 0.50	$ 0.50
Unrecognized equity-based compensation cost \| $	$ 10,600,000				$ 10,600,000
Weighted average period for recognition of unrecognized equity-based compensation cost					2 years 4 days
2014 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grant (in shares)	3,000,000				3,000,000
Number of shares available for award (in shares)	1,186,034				1,186,034
Compensation expense \| $					$ 4,000,000	$ 12,100,000	$ 6,400,000
2014 Incentive Plan \| RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)					152,738	99,000	1,185,000
Multiplier, threshold performance					50.00%
Multiplier, target performance					100.00%
Multiplier, maximum performance					150.00%
EBITDA goal, percentage of likelihood					70.00%
Compensation expense \| $					$ (1,000,000)	$ 6,600,000	$ 3,600,000
Number of RSUs outstanding (in shares)	1,171,238				1,171,238	1,168,500	1,161,000			0
Vested (in shares)					24,000	27,000	24,000
2014 Incentive Plan \| RSAs \| Executives and non-executive members of management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense, amount recorded to true-up prior periods \| $	$ 0	$ (6,000,000)	$ 0	$ 0
Allocated share-based compensation expense, amount recorded to true-up prior periods (in dollars per share) \| $ / shares					$ 0.12
Compensation expense \| $					$ (2,000,000)	$ 5,700,000	$ 2,800,000
2014 Incentive Plan \| RSAs \| Independent directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense \| $					$ 1,000,000
Number of shares issued (in shares)					24,000
2014 Incentive Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)					30,925	32,000	576,000
Expected compensation expense \| $					$ 18,400,000
Compensation expense \| $					$ 5,000,000	$ 5,500,000	$ 2,800,000
Number of RSUs outstanding (in shares)	382,372				382,372	568,000	576,000			0
Vested (in shares)					160,553	11,333	0
Unearned compensation expense \| $	$ 5,100,000				$ 5,100,000
2014 Incentive Plan \| RSUs \| Vesting 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage					30.00%
2014 Incentive Plan \| RSUs \| Vesting 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage					30.00%
2014 Incentive Plan \| RSUs \| Vesting 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage					40.00%
2014 Incentive Plan \| RSUs \| Executives and non-executive members of management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)					30,925
RSUs granted (in shares)	638,925				638,925
Number of RSUs outstanding (in shares)	382,372				382,372
2010 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grant (in shares)	2,000,000				2,000,000
Compensation expense \| $					$ 0	$ 200,000	$ 400,000
2010 Stock Plan \| RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)					0	0	0	100,000	320,000
Number of RSUs outstanding (in shares)	0				0	0	33,334			66,667
Annual vesting percentage					33.30%				20.00%
Vested (in shares)					0	33,334	33,333
Historic multiple of EBITDA, used to calculate internal enterprise value for determining size of awards								7.5
2010 Stock Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense \| $					$ 0	$ 100,000	$ 300,000
Award vesting period					3 years
Awarded options to purchase number of shares (in shares)					0	0	0
Award term					10 years
Annual vesting percentage					33.30%
Intrinsic value of outstanding options \| $	$ 300,000				$ 300,000
2010 Stock Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense \| $					$ 0	$ 100,000	$ 100,000
2007 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grant (in shares)	1,250,000				1,250,000
Compensation expense \| $					$ 0	100,000	600,000
2007 Stock Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense \| $					$ 0	$ 100,000	$ 600,000
Awarded options to purchase number of shares (in shares)					0	0	0
Award term					10 years
Annual vesting percentage					33.30%
Intrinsic value of outstanding options \| $	$ 300,000				$ 300,000
2007 Stock Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares converted from RSAs to RSUs outstanding (in shares)	195,055				195,055
Converted RSUs delivered (in shares)					29,945
2007 Stock Plan \| Converted from RSAs to RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares converted from RSAs to RSUs outstanding (in shares)											225,000
Threshold Performance \| 2014 Incentive Plan \| RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSAs that may be earned (in shares)					390,413
2020 EBITDA goal \| $					$ 198,900,000
Expected compensation expense \| $					$ 12,200,000
Number of RSUs outstanding (in shares)	363,413				363,413
Unearned compensation expense \| $	$ 5,500,000				$ 5,500,000
2020 EBITDA Target Performance \| 2014 Incentive Plan \| RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSAs that may be earned (in shares)					780,825
2020 EBITDA goal \| $					$ 221,000,000
Maximum Performance \| 2014 Incentive Plan \| RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSAs that may be earned (in shares)					1,171,238
Maximum Performance \| 2014 Incentive Plan \| RSAs \| Executives and non-executive members of management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)					128,738