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Other Expense (Income), Net - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | Nov. 30, 2012 | Feb. 28, 2013 | 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 | Feb. 28, 2013 Kemrock Industries and Exports Limited | May 31, 2012 Kemrock Industries and Exports Limited | May 31, 2011 Kemrock Industries and Exports Limited | May 31, 2012 Kemrock global depository receipts
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 |  |  |  |  |  |  |  |  | $ 0 | $ 42,200,000 | $ 24,200,000 |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  | 23.00% | 18.00% |
Purchase of global depository receipt, value |  |  |  |  |  |  |  |  |  |  |  | 7,200,000
Investment in affiliate |  |  |  |  |  | 22,700,000 |  | 22,700,000 |  |  |  |
Investment in affiliate, interest rate |  |  |  |  |  | 5.50% | 5.50% | 5.50% |  |  |  |
Impairment loss on equity method investment |  | 10,100,000 | 32,100,000 | 42,200,000 |  |  |  |  |  |  |  |
Loss on Kemrock conversion option |  | 800,000 | 8,200,000 | 9,000,000 | (9,030,000) |  |  |  |  |  |  |
Loss on Brazil operational repositioning | $ 6,087,000 |  |  |  | $ 6,087,000 |  |  |  |  |  |  |

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