Discontinued Operations - Results of Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]
Net Sales		$ 45		$ 66
Operating (loss) income of discontinued operations		(42)		19
(Loss) income before income taxes		(42)		19
Income tax expense	$ 0	0	$ 0	0
(Loss) income from discontinued operations, net of taxes		$ (42)		$ 19