Discontinued Operations - Results of Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
Aug. 31, 2015	Aug. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Net Sales	$ 21	$ 7,825
Operating income (loss) of discontinued operations	61	(2,564)
Income (loss) before income taxes	61	(2,564)
Income tax benefit	0	0
Income (loss) from discontinued operations, net of taxes	$ 61	$ (2,564)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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