Other Compensation Plans (Details) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 22, 2016 USD ($)	Jan. 22, 2016 USD ($) hour	Jan. 23, 2015 USD ($)	Apr. 24, 2015 USD ($)
Compensation and Retirement Disclosure [Line Items]
Minimum hours of service required for 401(k) eligibility (at least) \| hour		1,000
Other noncurrent compensation arrangements	$ 216	$ 216		$ 958
Total deferred compensation liabilities	21,403	21,403		30,736
Less current portion (1)	(3,796)	(3,796)		(8,255)
Noncurrent deferred compensation liabilities	17,607	17,607		22,481
Rabbi trust assets	20,534	20,534		32,302
Liquidation of rabbi trust assets	5,245	5,245	$ 0
Liquidation of cash value from COLI policies	4,755
BEEDP and BEDDP Plans
Compensation and Retirement Disclosure [Line Items]
Liability for deferred cash obligations	12,799	12,799		17,904
Liability for deferred share-based obligations in BEEDP and BEDDP Plans	572	572		2,676
SERP Plan
Compensation and Retirement Disclosure [Line Items]
Liability for deferred cash obligations	7,816	7,816		9,198
Prepaid Expenses and Other Current Assets [Member]
Compensation and Retirement Disclosure [Line Items]
Short-term securities held in Rabbit Trust	$ 4,128	$ 4,128		$ 487

Defined Contribution Plan, Hours of Service Required for Eligibility

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The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

+ References

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Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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The net cash inflow or outflow for the increase (decrease) associated with investments (not to include restricted cash) that are pledged or subject to withdrawal restrictions.

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Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements payable after one year (or the operating cycle, if longer) other than those specified elsewhere in the taxonomy.

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