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Assets and Liabilities Measured at Fair Value on Recurring Basis and Categorized using Fair Value Hierarchy (Parenthetical) (Detail) (Conversion option, Kemrock 5.5% bonds) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2012 | Aug. 31, 2012 | May 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment in affiliate, interest rate | 5.50% | 5.50% | 5.50%
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment in affiliate, interest rate |  | 5.50% | 5.50%

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- Details
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