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Summary of Securities in Unrealized Loss Position and Included in Accumulated Other Comprehensive Income, Aggregated by Length of Time Investments (Detail) (USD $) In Thousands, unless otherwise specified | Nov. 30, 2013 | May 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Total investments with unrealized losses, fair value | $ 35,851 | $ 36,582
Unrealized losses with a loss position for less than 12 months, fair value | 23,819 | 36,327
Unrealized losses with a loss position for more than 12 months, fair value | 12,032 | 255
Total investments with unrealized losses, gross unrealized losses | (1,581) | (1,034)
Unrealized losses with a loss position for less than 12 months, gross unrealized losses | (1,065) | (956)
Unrealized losses with a loss position for more than 12 months, gross unrealized losses | $ (516) | $ (78)

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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for twelve months or longer impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments on securities classified as available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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