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Investment (Income) , Net (Tables) | 6 Months Ended
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Nov. 30, 2013
Investment (Income) Expenses, Net | Investment (income) expense, net, consists of the following components:
|  | Three Months Ended November 30, |  |  | Six Months Ended November 30, |
(In thousands) |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Interest (income) |  | $ | (1,641 | ) |  | $ | (1,565 | ) |  | $ | (3,144 | ) |  | $ | (3,860 | )
(Gain) on sale of marketable securities |  |  | (227 | ) |  |  | (8 | ) |  |  | (2,424 | ) |  |  | (4,592 | )
Other-than-temporary impairment on securities |  |  | 111 |  |  |  | 450 |  |  |  | 162 |  |  |  | 564 |
Dividend (income) |  |  | (248 | ) |  |  | (241 | ) |  |  | (493 | ) |  |  | (450 | )
Investment (income) expense, net |  | $ | (2,005 | ) |  | $ | (1,364 | ) |  | $ | (5,899 | ) |  | $ | (8,338 | )

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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