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Fair Value - Additional Information (Detail) (USD $)	Feb. 28, 2013	May 31, 2012
Fair Value Measurements [Line Items]
Long-term debt at fair value including current maturities	$ 429,528,000	$ 274,754,000
Long-term debt at carrying amount including current maturities	$ 407,634,000	$ 258,791,000

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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