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Commitments and Contingencies (Details)
1 Months Ended 12 Months Ended
Apr. 30, 2015
Claim
May. 31, 2015
USD ($)
Claim
May. 31, 2014
USD ($)
May. 31, 2013
USD ($)
Future minimum lease payments        
2016   $ 8,766,000    
2017   6,291,000    
2018   5,527,000    
2019   4,916,000    
2020   3,639,000    
Thereafter   9,544,000    
Total   38,683,000    
Total rent expense   $ 10,600,000 $ 9,500,000 $ 7,200,000
Litigation        
Period over which potential acquisition-related contingent consideration would be payable   3 years    
Lawsuits on behalf of current and former employees        
Litigation        
Number of claims filed | Claim 2      
Lawsuits for alleged quality defects        
Litigation        
Number of claims filed | Claim   0    
Acquisition-related contingencies        
Litigation        
Potential acquisition-related contingent consideration, low end of range   $ 0    
Potential acquisition-related contingent consideration, high end of range   $ 19,400,000