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Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
Nov. 30, 2014
Feb. 28, 2015
May 31, 2016
May 31, 2015
May 31, 2014
May 31, 2013
May 31, 2012
Dec. 31, 2015
Goodwill and Intangible Assets (Textual) [Abstract]                      
Discount rate used in fair value calculation           12.50%          
Capitalization rate           8.50%          
Percentage of fair value, carrying value                     9.20%
Amortization expense $ 5,188 $ 4,011 $ 4,037 $ 8,048 $ 13,236 $ 17,964 $ 17,966 $ 16,562 $ 16,599 $ 9,393  
Adjustment of goodwill and deferred tax liabilities             $ 800        
Maximum                      
Goodwill and Intangible Assets (Textual) [Abstract]                      
Estimates useful life of intangible assets other than goodwill           18 years          
Minimum                      
Goodwill and Intangible Assets (Textual) [Abstract]                      
Estimates useful life of intangible assets other than goodwill           2 years          
Income Approach Valuation Technique                      
Goodwill and Intangible Assets (Textual) [Abstract]                      
Weight assigned to valuation methods           75.00%          
Market Approach Valuation Technique                      
Goodwill and Intangible Assets (Textual) [Abstract]                      
Weight assigned to valuation methods           25.00%