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Fair Value Measurements - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Millions | Aug. 29, 2015 | May. 30, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cost | $ 5.7 | $ 5.7
Unrealized Gain | 0.0 | 0.0
Unrealized Loss | 0.0 | 0.0
Market Value | 5.7 | 5.7
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cost | 0.2 | 0.2
Unrealized Gain | 0.0 | 0.0
Unrealized Loss | 0.0 | 0.0
Market Value | 0.2 | 0.2
Corporate Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cost | 0.6 | 0.6
Unrealized Gain | 0.0 | 0.0
Unrealized Loss | 0.0 | 0.0
Market Value | 0.6 | 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 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 + Details
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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 + Details
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