Income Taxes (Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
May 27, 2018	May 28, 2017	May 29, 2016
Income Tax Disclosure [Abstract]
U.S. statutory rate	29.40%	35.00%	35.00%
State and local income taxes, net of federal tax benefits	1.80%	1.70%	1.20%
Enactment of the Tax Act	(13.10%)	0.00%	0.00%
Benefit of federal income tax credits	(12.80%)	(9.20%)	(12.50%)
Other, net	(5.00%)	(3.20%)	(3.70%)
Effective income tax rate	0.30%	24.30%	20.00%

Effective Income Tax Rate Reconciliation, Tax Cuts And Jobs Act Of 2017, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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