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Investment (Income), Net (Tables) | 9 Months Ended
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Feb. 28, 2015
Investment (Income), Net | Investment (income), net, consists of the following components:
|  | Three Months Ended February 28, |  |  | Nine Months Ended February 28, |
(In thousands) |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Interest (income) |  | $ | (3,687 | ) |  | $ | (1,780 | ) |  | $ | (6,692 | ) |  | $ | (4,924 | )
(Gain) on sale of marketable securities |  |  | (3,356 | ) |  |  | (4,646 | ) |  |  | (8,677 | ) |  |  | (7,070 | )
Other-than-temporary impairment on securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 161 |
Dividend (income) |  |  | (650 | ) |  |  | (1,325 | ) |  |  | (1,185 | ) |  |  | (1,817 | )
Investment (income), net |  | $ | (7,693 | ) |  | $ | (7,751 | ) |  | $ | (16,554 | ) |  | $ | (13,650 | )

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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