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Fair Value Measurements (Tables) | 9 Months Ended
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Feb. 28, 2015
Fair Value Disclosures [Abstract] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis | The following tables set forth financial assets and liabilities measured at fair value in the Condensed Consolidated Balance Sheets and the respective pricing levels to which the fair value measurements are classified within the fair value hierarchy as of February 28, 2015 and May 31, 2014.
(In millions) | Fair Value Measurements
| February 28, 2015 |  | May 31, 2014
Financial Assets | Quoted Prices with Other Observable Inputs (Level 2) |  | Quoted Prices with Other Observable Inputs (Level 2)
Available-for-sale marketable securities: |  |  |
Asset-backed securities | $ | 0.3 |  |  | $ | 0.4 |
Corporate securities | 0.7 |  |  | 1.2 |
Government obligations | 4.9 |  |  | 7.9 |
Mortgage-backed securities | 0.5 |  |  | 1.6 |
Foreign currency forward contracts | 0.6 |  |  | 0.2 |
Deferred compensation plan | 7.6 |  |  | 6.3 |
Total | $ | 14.6 |  |  | $ | 17.6 |
Financial Liabilities |  |  |
Foreign currency forward contracts | $ | 0.5 |  |  | $ | 0.1 |
Total | $ | 0.5 |  |  | $ | 0.1 |
Unrealized Gain (Loss) on Investments | The following is a summary of the carrying and market values of the company's marketable securities as of the respective dates.
| February 28, 2015
(In millions) | Cost |  | Unrealized Gain |  | Unrealized Loss |  | Market Value
Asset-backed securities | $ | 0.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.3 |
Corporate securities | 0.7 |  |  | — |  |  | — |  |  | 0.7 |
Government obligations | 4.9 |  |  | — |  |  | — |  |  | 4.9 |
Mortgage-backed securities | 0.5 |  |  | — |  |  | — |  |  | 0.5 |
Total | $ | 6.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 6.4 |
| May 31, 2014
(In millions) | Cost |  | Unrealized Gain |  | Unrealized Loss |  | Market Value
Asset-backed securities | $ | 0.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.4 |
Corporate securities | 1.2 |  |  | — |  |  | — |  |  | 1.2 |
Government obligations | 7.9 |  |  | — |  |  | — |  |  | 7.9 |
Mortgage-backed securities | 1.6 |  |  | — |  |  | — |  |  | 1.6 |
Total | $ | 11.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 11.1 |
Investments Classified by Contractual Maturity Date | Maturities of debt securities included in marketable securities as of February 28, 2015, are as follows.
(In millions) | Cost |  | Fair Value
Due within one year | $ | 2.7 |  |  | $ | 2.7 |
Due after one year through five years | 3.6 |  |  | 3.6 |
Due after five years through ten years | — |  |  | — |
Due after more than ten years | 0.1 |  |  | 0.1 |
Total | $ | 6.4 |  |  | $ | 6.4 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a,b,bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL7498348-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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