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Stockholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
May 31, 2016
USD ($)
$ / shares
shares
Oct. 29, 2014
$ / shares
shares
Oct. 05, 2011
shares
Feb. 29, 2016
USD ($)
Nov. 30, 2015
USD ($)
Aug. 31, 2015
USD ($)
May 31, 2015
USD ($)
$ / shares
shares
Feb. 28, 2015
USD ($)
Nov. 30, 2014
USD ($)
Aug. 31, 2014
USD ($)
Nov. 30, 2015
USD ($)
Nov. 30, 2014
USD ($)
Feb. 29, 2016
USD ($)
Feb. 28, 2015
USD ($)
May 31, 2016
USD ($)
installment
working_hour
Employees
$ / shares
shares
May 31, 2015
USD ($)
$ / shares
shares
May 31, 2014
USD ($)
$ / shares
shares
May 31, 2013
USD ($)
May 31, 2012
USD ($)
Other Ownership Interests [Line Items]                                      
Authorized capital stock   80,000,000                                  
Shares of common stock (shares) 75,000,000 75,000,000         75,000,000               75,000,000 75,000,000      
Common stock, par value (usd per share) | $ / shares $ 0.01 $ 0.01         $ 0.01               $ 0.01 $ 0.01      
Preferred stock, shares authorized (shares) 5,000,000 5,000,000         5,000,000               5,000,000 5,000,000      
Preferred stock, par value (usd per share) | $ / shares $ 0.01 $ 0.01         $ 0.01               $ 0.01 $ 0.01      
Common stock, votes per share   1                                  
Percentage of grants to employees vesting                             25.00%        
Option grants to employees vesting period                             4 years        
Percentage of grants for consultants vesting                             100.00%        
Option grants to consultants vesting period                             1 year        
Subsequent grants for directors vesting                             33.33%        
Subsequent grants for directors vesting period                             3 years        
Option grants in the period, weighted average grant date fair value (usd per share) | $ / shares                             $ 4.16 $ 4.74 $ 4.10    
Risk free interest rate                             1.48% 1.54% 1.44%    
Expected volatility rate                             31.00% 31.00% 34.00%    
Expected term                             4 years 9 months 21 days 4 years 9 months 3 days 4 years 8 months 25 days    
The total intrinsic value of options exercised | $                             $ 100 $ 1,600 $ 1,000    
Compensation not yet recognized | $ $ 3,300                           3,300        
Proceeds from stock options exercised | $                             1,300 4,300 1,300    
Stock based compensation pre tax amount | $                             $ 100 $ 500 $ 100    
Grants in the period, weighted average grant date fair value (usd per share) | $ / shares                             $ 15.21 $ 14.75 $ 13.23    
Tax benefit from compensation expense | $                             $ 1,000 $ 2,000 $ 1,800    
Share-based Compensation | $                             $ 3,240 $ 5,998 $ 5,502    
Average price of share issued | $ / shares $ 10.67           11.89               $ 10.67 $ 11.89 $ 9.30    
Nonvested compensation, weighted average grant date fair valur (usd per share) | $ / shares $ 14.62           $ 13.73               $ 14.62 $ 13.73      
Nonvested compensation (shares) 549,777           563,101               549,777 563,101      
Income tax expense (benefit) | $       $ 351 $ (337) $ 70 $ 740 $ (7,599) $ 1,304 $ 812 $ (267) $ 2,116 $ 84 $ (5,483) $ 40,337 $ (4,743) $ 2,839 $ (286) $ (322)
Options awarded (shares)                             259,917        
Shares awarded (shares)                             564,380        
Performance Share and Restricted Stock Unit Awards                                      
Other Ownership Interests [Line Items]                                      
Total fair value of restricted stock awards vesting | $                             $ 2,500 2,400 $ 1,800    
Restricted Stock                                      
Other Ownership Interests [Line Items]                                      
Period of recognition for costs not yet recognized 2 years                                    
Employee service, compensation cost not yet recognized | $ $ 5,400                           5,400        
Performance Shares                                      
Other Ownership Interests [Line Items]                                      
Employee service, compensation cost not yet recognized | $ $ 4,600           $ 2,200               $ 4,600 $ 2,200      
Nonvested compensation, weighted average grant date fair valur (usd per share) | $ / shares $ 18.07           $ 19.83               $ 18.07 $ 19.83 $ 25.56    
Performance period                             3 years        
Nonvested compensation (shares) 400,000           200,000               400,000 200,000      
Weighted average remaining contractual term                             3 years 3 years      
Continuing Operations                                      
Other Ownership Interests [Line Items]                                      
Income tax expense (benefit) | $           $ 1,300       $ 500         $ 800        
Shareholders' Equity                                      
Other Ownership Interests [Line Items]                                      
Income tax expense (benefit) | $                               $ 100      
Employee Stock Option                                      
Other Ownership Interests [Line Items]                                      
Period of recognition for costs not yet recognized                             3 years        
Chief Executive Officer | Performance Shares                                      
Other Ownership Interests [Line Items]                                      
Options awarded (shares)                             250,000        
Term of award                             3 years        
Chief Executive Officer | Restricted Stock Units                                      
Other Ownership Interests [Line Items]                                      
Options awarded (shares)                             50,000        
Award vesting installments (installment) | installment                             4        
Chief Executive Officer | Employee Stock Option                                      
Other Ownership Interests [Line Items]                                      
Shares awarded (shares)                             200,000        
Award vesting installments (installment) | installment                             4        
Chief Executive Officer | Minimum | Performance Shares                                      
Other Ownership Interests [Line Items]                                      
Payouts as a percent of grant amount                             0.00%        
Chief Executive Officer | Maximum | Performance Shares                                      
Other Ownership Interests [Line Items]                                      
Payouts as a percent of grant amount                             20000.00%        
1997 Stock Option Plan                                      
Other Ownership Interests [Line Items]                                      
Total number of common stock available to be issued 1,497,674                           1,497,674        
Options exercisable period                             10 years        
2004 Stock and Incentive Award Plan                                      
Other Ownership Interests [Line Items]                                      
Total number of common stock available to be issued 2,200,000                           2,200,000        
Options exercisable period                             10 years        
Total number of common stock reserved for issuance 6,750,000                           6,750,000        
Incentive award plan to increase the minimum number of shares     200,000                                
Incentive award plan to increase the maximum number of shares     500,000                                
2004 Stock and Incentive Award Plan | Maximum                                      
Other Ownership Interests [Line Items]                                      
Total number of common stock available to be issued 800,000                           800,000        
Stock Purchase Plan                                      
Other Ownership Interests [Line Items]                                      
Total number of common stock available to be issued 1,000,000.0                           1,000,000.0        
Share purchase periods | Employees                             2        
Duration of purchase of shares                             6 months        
Employee eligible in participating in offering period                             6 months        
Maximum number of shares to be offered 2,000,000                           2,000,000        
Working schedule of employee to participate in offering period                             20 or more hours per week and more than five months in a calendar year        
Number of working hours to be eligible (working hour) | working_hour                             20        
Number of working months to be eligible                             5 months        
Employees ownership threshold                             5.00%        
Percentage of fair market value of a share of common stock on the first day of the offering period                             85.00%        
Percentage of fair market value of a share of common stock on the last day of the offering period                             85.00%        
Number of additional shares reserved for issuance (shares)                               800,000      
Maximum number of shares to be offered under the Stock Purchase Plan                             137,957 119,001 146,275