SUMMARY OF THE CHANGES IN FAIR VALUE OF THE LEVEL 3 (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2016	May 31, 2015
Changes in fair value of the Level 3 classified Holdback Payment Earn-Out Payments asset
Fair value at May 31, 2014	$ 895	$ 895
Payments received	(604)	(604)
Change in fair value	85	85
Fair value at May 31, 2015	376	376
Change in fair value	(46)	(46)
Payments received	(200)	(200)
Fair value at May 31, 2016	$ 130	$ 130