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STOCK REPURCHASE PROGRAM - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2011	Nov. 30, 2010
Share Repurchases [Line Items]
Repurchase of common stock, shares			164,773
Repurchase of common stock, value	$ 2,802	$ 9,388	$ 3,008	$ 17,948
Minimum
Share Repurchases [Line Items]
Shares authorized to be repurchased, per year	1,000,000		1,000,000
Maximum
Share Repurchases [Line Items]
Shares authorized to be repurchased, per year	2,000,000		2,000,000

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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