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Summary of Marketable Securities by Asset Type (Detail) (USD $) In Thousands, unless otherwise specified | May 31, 2013 | May 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 105,483 | $ 117,732
Available-for-Sale Securities, Gross Unrealized Gains | 8,644 | 5,475
Available-for-Sale Securities, Gross Unrealized Losses | (1,034) | (3,078)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 113,093 | 120,129
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 83,094 | 82,131
Available-for-Sale Securities, Gross Unrealized Gains | 8,089 | 4,490
Available-for-Sale Securities, Gross Unrealized Losses | (891) | (3,059)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 90,292 | 83,562
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,090 | 1,016
Available-for-Sale Securities, Gross Unrealized Gains | 244 | 79
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 1,334 | 1,095
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 24,492 | 24,380
Available-for-Sale Securities, Gross Unrealized Gains | 5,265 | 2,776
Available-for-Sale Securities, Gross Unrealized Losses | (392) | (1,046)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 29,365 | 26,110
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 18,328 | 17,489
Available-for-Sale Securities, Gross Unrealized Gains | 1,901 | 521
Available-for-Sale Securities, Gross Unrealized Losses | (7) | (936)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 20,222 | 17,074
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 39,184 | 39,246
Available-for-Sale Securities, Gross Unrealized Gains | 679 | 1,114
Available-for-Sale Securities, Gross Unrealized Losses | (492) | (1,077)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 39,371 | 39,283
Fixed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,389 | 35,601
Available-for-Sale Securities, Gross Unrealized Gains | 555 | 985
Available-for-Sale Securities, Gross Unrealized Losses | (143) | (19)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,801 | 36,567
Fixed securities | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 20,528 | 19,347
Available-for-Sale Securities, Gross Unrealized Gains | 247 | 530
Available-for-Sale Securities, Gross Unrealized Losses | (139) | (12)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 20,636 | 19,865
Fixed securities | Kemrock convertible bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost |  | 13,670
Available-for-Sale Securities, Fair Value (Net Carrying Amount) |  | 13,670
Fixed securities | Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,724 | 2,305
Available-for-Sale Securities, Gross Unrealized Gains | 244 | 349
Available-for-Sale Securities, Gross Unrealized Losses |  | (5)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 1,968 | 2,649
Fixed securities | Foreign bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 37 | 38
Available-for-Sale Securities, Gross Unrealized Gains | 4 | 1
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 41 | 39
Fixed securities | Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 100 | 241
Available-for-Sale Securities, Gross Unrealized Gains | 60 | 105
Available-for-Sale Securities, Gross Unrealized Losses | (4) | (2)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 156 | $ 344

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- Definition This item represents the cost of debt and equity 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + 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=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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