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Other Expense (Income), Net - Additional Information (Detail) In Millions, except Share data, unless otherwise specified | 3 Months Ended |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2012 USD ($) | Aug. 31, 2012 INR | May 31, 2012 INR | Aug. 31, 2012 Kemrock Industries and Exports Limited USD ($) | May 31, 2012 Kemrock Industries and Exports Limited USD ($) | May 31, 2011 Kemrock Industries and Exports Limited USD ($) | May 31, 2012 Kemrock global depository receipts USD ($)
Component of Other Income, Nonoperating [Line Items] |  |  |  |  |  |  |
Acquisition of equity method investment, shares |  |  |  |  | 870,000 | 3,200,000 | 693,072
Equity method investment, carrying value |  |  |  | $ 10.0 | $ 42.2 | $ 24.2 |
Equity method investment, ownership percentage |  |  |  |  | 23.00% | 18.00% |
Purchase of global depository receipt, value |  |  |  |  |  |  | 7.2
Kemrock common stock market value per share |  | 116.6 | 531.0 |  |  |  |
Impairment loss on equity method investment | $ (32.1) |  |  |  |  |  |

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- Definition Gain Loss on Sale and Impairment of Equity Investments + References No definition available. + Details
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- Definition Price Of Common Stock + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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