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Discontinued Operations - Schedule of Balance Sheet and Income Statement Items (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Revenue and Income:        
Revenue from discontinued operations   $ 13,844   $ 42,758
Income from discontinued operations, before taxes   4,206   10,070
Income from discontinued operations, net of taxes $ 0 $ 2,699 $ 0 $ 6,504