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Fair Value Measurement - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
May 31, 2012
2% Convertible Notes
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Aug. 31, 2011
2% Convertible Notes
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May 31, 2011
2% Convertible Notes
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Nov. 30, 2003
2% Convertible Notes
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May 31, 2012
6.875% Senior Notes
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Aug. 31, 2011
6.875% Senior Notes
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May 31, 2012
5.625% Senior Notes
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Apr. 16, 2012
5.625% Senior Notes
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|---|---|---|---|---|---|---|---|---|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||||
| Outstanding debt, amount | $ 117.8 | $ 250.0 | $ 300.0 | |||||
| Fair value of long-term debt | $ 127.9 | $ 252.5 | $ 306.8 | |||||
| Debt instrument, interest rate | 2.00% | 2.00% | 2.00% | 2.00% | 6.875% | 6.875% | 5.625% | 5.625% |
| X | ||||||||||
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- Definition
Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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- Definition
The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. No definition available.
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