Other Compensation Plans Narrative (Details) $ in Thousands	12 Months Ended
	Apr. 29, 2016 USD ($) hour plan shares	Apr. 24, 2015 USD ($)	Apr. 25, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Minimum hours of service required for 401(k) eligibility (at least) | hour	1,000
Employer match contribution	$ 2,073	$ 1,418	$ 452
Number of nonqualified deferred compensation plans | plan	3
Deferred compensation obligation, shares | shares	14,773
Rabbi trust assets	$ 20,662	32,302
Proceeds from liquidation of rabbi trust assets	5,245	0	0
Liquidation of cash value from COLI policies	4,755
Prepaid Expenses and Other Current Assets
Defined Benefit Plan Disclosure [Line Items]
Short-term securities held in Rabbi Trust	3,290	487
SERP
Defined Benefit Plan Disclosure [Line Items]
Cash contributions expense		526	580
BEEDP and BEDDP Plans
Defined Benefit Plan Disclosure [Line Items]
Expenses related to investments of employee deferrals	1,640	1,351	$ 1,942
Share based obligations	$ 673	$ 2,676