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Fair Value Measurements - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Millions	Sep. 03, 2016	May 28, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cost	$ 7.6	$ 7.5
Unrealized Gain	0.1	0.0
Unrealized Loss	0.0	0.0
Market Value	7.7	7.5
US Treasury and Government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cost	0.4	0.4
Unrealized Gain	0.0	0.0
Unrealized Loss	0.0	0.0
Market Value	0.4	0.4
Fixed Income Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cost	6.6	6.4
Unrealized Gain	0.0	0.0
Unrealized Loss	0.0	0.0
Market Value	6.6	6.4
Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cost	0.6	0.7
Unrealized Gain	0.1	0.0
Unrealized Loss	0.0	0.0
Market Value	$ 0.7	$ 0.7

X

- 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

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-Section 45
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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 320
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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)
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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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