XML 53 R41.htm IDEA: XBRL DOCUMENT v3.5.0.2
Investment (Income), Net (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Other Income And Expenses [Abstract]    
Interest (income) $ (1,140) $ (1,364)
(Gain) on sale of marketable securities (2,584) (2,376)
Other-than-temporary impairment on securities 186  
Dividend (income) (300) (328)
Investment (income), net $ (3,838) $ (4,068)