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Fair Value Measurements - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended |  |
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Nov. 30, 2012 USD ($) | Nov. 30, 2012 USD ($) | Nov. 30, 2012 EUR (€) | Nov. 30, 2012 INR | May 31, 2012 INR | Apr. 30, 2012 Conversion option, Kemrock 5.5% bonds | Nov. 30, 2012 Conversion option, Kemrock 5.5% bonds | May 31, 2012 Conversion option, Kemrock 5.5% bonds | Nov. 30, 2012 Unsecured Senior Notes | Nov. 30, 2012 Fair Value, Measurements, Recurring Cross-currency swap USD ($) | May 31, 2012 Fair Value, Measurements, Recurring Cross-currency swap USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts, fair value of liability |  |  |  |  |  |  |  |  |  | $ 10,638,000 | $ 2,159,000
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 | $ (847,000) | $ (9,030,000) |  |  |  |  |  |  |  |  |
Investment in affiliate, interest rate |  |  |  |  |  | 5.50% | 5.50% | 5.50% |  |  |
Kemrock common stock market value per share |  |  |  | 56.70 | 531.00 |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + References No definition available. + Details
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