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Fair Value Measurements - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Millions	Feb. 27, 2016	May. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Unrealized Gain	$ 0.0	$ 0.0
Unrealized Loss	0.0	0.0
Market Value	7.3	5.7
Cost	7.3	5.7
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Unrealized Gain		0.0
Unrealized Loss		0.0
Market Value		0.2
Cost		0.2
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Unrealized Gain		0.0
Unrealized Loss		0.0
Market Value		0.6
Cost		0.6
US Treasury and Government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Unrealized Gain	0.0	0.0
Unrealized Loss	0.0	0.0
Market Value	0.4	4.4
Cost	0.4	4.4
Collateralized Mortgage Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Unrealized Gain		0.0
Unrealized Loss		0.0
Market Value		0.5
Cost		$ 0.5
Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Unrealized Gain	0.0
Unrealized Loss	0.0
Market Value	6.9
Cost	$ 6.9

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- Definition

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

+ References

No definition available.

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

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ 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 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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- Definition

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+ 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

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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