Summary of the changes in fair value of the Level 3 (Details) - in Thousands $ in Thousands	3 Months Ended
	Aug. 31, 2015 USD ($)
Changes in fair value of the Level 3 classified Holdback Payment Earn-Out Payments asset
Fair value at May 31, 2014	$ 895
Payments received	(604)
Change in fair value	85
Fair value at May 31, 2015	376
Change in fair value ,	10
Fair value at August 31, 2015	$ 386