Discontinued Operations - Results of Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Discontinued Operations and Disposal Groups [Abstract]
Net Sales	$ 5	$ 52	$ 71	$ 9,767
Operating (loss) income of discontinued operations	(6)	(86)	13	(5,944)
Loss on disposal of discontinued operations				(231)
(Loss) income before income taxes	(6)	(86)	13	(6,175)
Income tax expense	0	0	0	0
(Loss) income from discontinued operations, net of taxes	$ (6)	$ (86)	$ 13	$ (6,175)

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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