Reconciliation of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
May 31, 2012	May 31, 2010
Income Tax Contingency [Line Items]
Beginning Balance	$ 5,381,000	$ 5,933,000
Increases - tax positions taken in prior years	961,000
Decreases - tax positions taken in prior years	(540,000)
Increases (decreases) - current tax positions
Settlements	(683,000)
Lapse of statutes of limitations	(709,000)
Ending Balance	$ 4,410,000	$ 5,933,000

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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