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Marketable Securities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2013 | Feb. 29, 2012 | Feb. 28, 2013 | Feb. 29, 2012 | May 31, 2012 | 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 Maximum | Apr. 30, 2012 Maximum Conversion option, Kemrock 5.5% bonds | May 31, 2012 Maximum Conversion option, Kemrock 5.5% bonds | Apr. 30, 2012 Minimum Conversion option, Kemrock 5.5% bonds | May 31, 2012 Minimum Conversion option, Kemrock 5.5% bonds
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities, current | $ 106.1 |  | $ 106.1 |  | $ 106.5 |  |  |  |  |  |  |  |
Available-for-sale securities, long-term | 11.6 |  | 11.6 |  | 13.6 |  |  |  |  |  |  |  |
Investment in affiliate |  |  |  |  |  | 22.7 |  | 22.7 |  |  |  |  |
Investment in affiliate, interest rate |  |  |  |  |  | 5.50% | 5.50% | 5.50% |  |  |  |  |
Debt securities, conversion date |  |  |  |  |  |  |  |  |  | Jun. 12, 2017 | Jun. 12, 2017 | Jun. 04, 2012 | Jun. 04, 2012
Gross gains realized on sales of investments | 3.1 | 0.3 | 8.1 | 4.1 |  |  |  |  |  |  |  |  |
Gross losses realized on sales of investments | 0.2 | 0.1 | 0.6 | 4.8 |  |  |  |  |  |  |  |  |
Losses recognized for securities deemed to have other-than-temporary impairments | $ 0 | $ 0.1 | $ 0.6 | $ 0.8 |  |  |  |  |  |  |  |  |
Investments with unrealized loss, percentage of fair values less than original cost |  |  |  |  |  |  |  |  | 15.00% |  |  |  |

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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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