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Investment (Income) Expense, Net (Tables) | 3 Months Ended
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Aug. 31, 2013
Investment (Income) Expenses, Net | Investment (income) expense, net, consists of the following components:
|  | Three Months Ended |
(In thousands) |  | August 31, 2013 |  |  | August 31, 2012 |
Interest (income) |  | $ | (1,503 | ) |  | $ | (2,295 | )
(Gain) on sale of marketable securities |  |  | (2,197 | ) |  |  | (4,584 | )
Other-than-temporary impairment on securities |  |  | 51 |  |  |  | 113 |
Dividend (income) |  |  | (245 | ) |  |  | (208 | )
Investment (income) expense, net |  | $ | (3,894 | ) |  | $ | (6,974 | )

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- Definition Tabular disclosure of interest income and other income elements which are not separately disclosed on the income statement. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration