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Fair Value Measurements - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
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May 31, 2013 USD ($) | Nov. 30, 2012 USD ($) | Aug. 31, 2012 USD ($) | Nov. 30, 2012 USD ($) | May 31, 2013 USD ($) | May 31, 2013 EUR (€) | May 31, 2013 INR | Nov. 30, 2012 INR | May 31, 2012 INR | Apr. 30, 2012 Conversion option, Kemrock 5.5% bonds | May 31, 2013 Conversion option, Kemrock 5.5% bonds USD ($) | May 31, 2012 Conversion option, Kemrock 5.5% bonds | May 31, 2013 Unsecured Senior Notes | May 31, 2013 Fair Value, Measurements, Recurring Cross-currency swap USD ($) | May 31, 2012 Fair Value, Measurements, Recurring Cross-currency swap USD ($) | May 31, 2013 Fair Value, Measurements, Recurring Foreign currency forward contract USD ($) | May 31, 2012 Fair Value, Measurements, Recurring Foreign currency forward contract USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts, fair value of liability |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,048,000 | $ 2,159,000 | $ 4,751,000 | $ 1,356,000
Debt, interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 6.70% |  |  |  |
Debt, due date |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 01, 2015 |  |  |  |
Effective euro fixed-rate borrowing | 5.31% |  |  |  | 5.31% |  |  |  |  |  |  |  |  |  |  |  |
Notional principal amount of cross-currency swap | 150,000,000 |  |  |  | 150,000,000 | 125,000,000 |  |  |  |  |  |  |  |  |  |  |
Loss on Kemrock conversion option |  | 800,000 | 8,200,000 | 9,000,000 | (9,030,000) |  |  |  |  |  |  |  |  |  |  |  |
Investment in affiliate, interest rate |  |  |  |  |  |  |  |  |  | 5.50% |  | 5.50% |  |  |  |  |
Kemrock common stock market value per share |  |  |  |  |  |  | 43.85 | 56.70 | 531.00 |  |  |  |  |  |  |  |
Impairment of investments | $ 18,500,000 |  | $ 40,300,000 |  | $ 51,092,000 |  |  |  |  |  | $ 13,700,000 |  |  |  |  |  |

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- Definition Net Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + 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 contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date. + References No definition available. + Details
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