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Investment (Income), Net (Tables) | 6 Months Ended
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Nov. 30, 2014
Investment (Income), Net | Investment (income), net, consists of the following components:
|  | Three Months Ended November 30, |  |  | Six Months Ended November 30, |
(In thousands) |  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Interest (income) |  | $ | (1,601 | ) |  | $ | (1,641 | ) |  | $ | (3,005 | ) |  | $ | (3,144 | )
(Gain) on sale of marketable securities |  |  | (3,204 | ) |  |  | (227 | ) |  |  | (5,320 | ) |  |  | (2,424 | )
Other-than-temporary impairment on securities |  |  | — |  |  |  | 111 |  |  |  | — |  |  |  | 162 |
Dividend (income) |  |  | (253 | ) |  |  | (248 | ) |  |  | (536 | ) |  |  | (493 | )
Investment (income), net |  | $ | (5,058 | ) |  | $ | (2,005 | ) |  | $ | (8,861 | ) |  | $ | (5,899 | )

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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
Name: | us-gaap_InterestAndOtherIncomeTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration