Stock-Based Compensation - PSUs (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
Jul. 26, 2016	Jun. 26, 2016
Performance Stock Units
PSU Activity
Unvested shares available for issue under outstanding PSUs, beginning of period (in shares)		138,925
Granted (in shares)		194,000
Vested (in shares)		(26,736)
Forfeited/cancelled (in shares)		(106,000)
Unvested shares available for issue under outstanding PSUs, end of period (in shares)		200,189
Unvested PSUs, Weighted-Average Fair Value at Grant Date
Unvested shares available for issue under outstanding PSUs, beginning of period (in dollars per share)		$ 21.46
Granted (in dollars per share)		10.78
Vested (in dollars per share)		19.40
Forfeited/cancelled (in dollars per share)		21.82
Unvested shares available for issue under outstanding PSUs, end of period (in dollars per share)		$ 11.19
Additional stock based compensation information
Shares earned, but not yet vested (in shares)		9,189
Measurement period		1 year
Canceled shares, employee departures (in shares)		3,000
Unvested shares not-yet-earned (in shares)		191,000
Unrecognized compensation costs (in dollars)		$ 2.0
1994 Plan
Stock-based compensation
Number of shares authorized (in shares)		3,553,125
Subsequent Event \| 1994 Plan
Stock-based compensation
Number of additional shares authorized (in shares)	650,000
Number of shares authorized (in shares)	4,203,125

Performance measurement period relating to Performance stock unit.

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

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Number of awards earned by participants for meeting certain performance targets, but not yet vested, as of the balance sheet date.

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Number of unvested awards not yet earned by participants.

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

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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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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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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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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 additional shares authorized for issuance under an established share-based compensation plan.

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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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