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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 | Aug. 31, 2012 | May 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Total investments with unrealized losses, fair value | $ 24,325 | $ 43,772
Unrealized losses with a loss position for less than 12 months, fair value | 22,723 | 42,114
Unrealized losses with a loss position for more than 12 months, fair value | 1,602 | 1,658
Total investments with unrealized losses, gross unrealized losses | (986) | (3,078)
Unrealized losses with a loss position for less than 12 months, gross unrealized losses | (441) | (2,596)
Unrealized losses with a loss position for more than 12 months, gross unrealized losses | $ (545) | $ (482)

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- Definition Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer 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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