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Fair Value Measurement - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	May 31, 2012 2% Convertible Notes	Aug. 31, 2011 2% Convertible Notes	May 31, 2011 2% Convertible Notes	Nov. 30, 2003 2% Convertible Notes	May 31, 2012 6.875% Senior Notes	Aug. 31, 2011 6.875% Senior Notes	May 31, 2012 5.625% Senior Notes	Apr. 16, 2012 5.625% Senior Notes
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%

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.

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