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Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Aug. 30, 2014 | Aug. 31, 2013 | May 31, 2014
Investment [Line Items] |  |  |
Investment in time deposits and certificate of deposits | $ 34.6 |  | $ 32.7
Investment in time deposits and certificate of deposits, less than twelve months | 26.4 |  | 31.7
Investment in time deposits and certificate of deposits, greater than twelve months | 8.2 |  | 1.0
Investments, which are included in non-current assets | $ 0.5 |  | $ 0.5
Proceeds from the sale of securities description | less than $0.1 million | 0.1 |
Gross realized gains and losses on sale, description | less than $0.1 million | less than $0.1 |
Net unrealized holding gains, description | less than $0.1 million | less than $0.1 |

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- Definition Amount of equity securities categorized neither as held-to-maturity nor as 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=28360136&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 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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