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Fair Value Measurements - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Millions	Nov. 28, 2015	May. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cost	$ 5.4	$ 5.7
Unrealized Gain	0.0	0.0
Unrealized Loss	0.0	0.0
Market Value	5.4	5.7
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cost	0.1	0.2
Unrealized Gain	0.0	0.0
Unrealized Loss	0.0	0.0
Market Value	0.1	0.2
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cost	0.4	0.6
Unrealized Gain	0.0	0.0
Unrealized Loss	0.0	0.0
Market Value	0.4	0.6
US Treasury and Government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cost	4.4	4.4
Unrealized Gain	0.0	0.0
Unrealized Loss	0.0	0.0
Market Value	4.4	4.4
Collateralized Mortgage Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cost	0.5	0.5
Unrealized Gain	0.0	0.0
Unrealized Loss	0.0	0.0
Market Value	$ 0.5	$ 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 cost of debt 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 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

Reference 2: 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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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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