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Commitments and Contingencies (Details Textual) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended
Jan. 14, 2014
Nov. 08, 2012
May 31, 2014
Petition
Lawsuit
May 31, 2013
May 31, 2012
Commitments and Contingencies (Textual) [Abstract]          
Aggregate rental costs under operating leases     $ 2,000,000 $ 2,500,000 $ 3,100,000
Number of lawsuits against biolitec previously settled for which seeking defense and indemnification     2    
Partial judgment granted   23,200,000      
Judgment entered in favor 74,900,000        
Number of petitions filed for reexamination of patents     3    
Number of rejected patent claims     40 of 41 patent    
Total future purchase obligations due through 2018     12,500,000    
Purchase obligations after 2018     $ 0