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Fair Value of Financial Assets - Schedule of Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Millions	May 28, 2016	May 30, 2015
Gain (Loss) on Investments
Cost	$ 7.5	$ 5.7
Unrealized Gain	0.0	0.0
Unrealized Loss	0.0	0.0
Market Value	7.5	5.7
Mutual funds - fixed income
Gain (Loss) on Investments
Cost	6.4
Unrealized Gain	0.0
Unrealized Loss	0.0
Market Value	6.4
Mutual funds - equity
Gain (Loss) on Investments
Cost	0.7
Unrealized Gain	0.0
Unrealized Loss	0.0
Market Value	0.7
Asset-Backed Securities
Gain (Loss) on Investments
Cost		0.2
Unrealized Gain		0.0
Unrealized Loss		0.0
Market Value		0.2
Corporate Debt Securities
Gain (Loss) on Investments
Cost		0.6
Unrealized Gain		0.0
Unrealized Loss		0.0
Market Value		0.6
Government Obligations
Gain (Loss) on Investments
Cost	0.4	4.4
Unrealized Gain	0.0	0.0
Unrealized Loss	0.0	0.0
Market Value	$ 0.4	4.4
Mortgage-Backed Securities
Gain (Loss) on Investments
Cost		0.5
Unrealized Gain		0.0
Unrealized Loss		0.0
Market Value		$ 0.5

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- Definition

This item represents the gross unrealized gains of debt and equity securities, derivatives, and long-term debt.

+ References

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- Definition

This item represents the gross unrealized losses of debt and equity securities, derivatives, and long-term debt.

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562

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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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