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Summary of the changes in fair value of the Level 3 (Details)
$ in Thousands
Feb. 29, 2016
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 (30)
Fair value at February 29, 2016 $ 346