Retirement Plans (Weighted-Average Assumptions Used) (Details)	12 Months Ended
May 27, 2018	May 28, 2017	May 29, 2016
Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average assumptions used to determine benefit obligations, discount rate (percentage)	4.32%	4.06%
Weighted-average assumptions used to determine net expense, discount rate (percentage)	4.06%	4.18%
Weighted-average assumptions used to determine net expense, expected long-term rate of return on plan assets (percentage)	5.75%	6.50%	6.50%
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Weighted-average assumptions used to determine benefit obligations, discount rate (percentage)	4.28%	3.98%
Weighted-average assumptions used to determine net expense, discount rate (percentage)	3.98%	4.00%

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- Definition

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.

+ References

No definition available.

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