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Common Shares and Treasury Stock
 12 Months Ended
May 31, 2019
Class of Stock Disclosures [Abstract]  
Common Shares and Treasury Stock
17.
COMMON SHARES AND TREASURY STOCK
As of May 31, 2018 and 2019, the Company had 300,000,000 common shares authorized with par value of US$0.01.
The movement of the outstanding common shares and treasury stock is listed as below.
  
Number of
common shares
  
Number of
treasury stock
 
Shares outstanding as of May 31, 2016
  157,439,397   939,990 
Reissuance of treasury stock for NES
  200,000   (200,000) 
Reissuance of treasury stock for the exercises of options
  48,047   (48,047) 
Shares repurchase
  —     —   
  
 
 
  
 
 
 
Shares outstanding as of May 31, 2017
  157,687,444   691,943 
  
 
 
  
 
 
 
Reissuance of treasury stock for NES
  631,966   (631,966) 
Reissuance of treasury stock for the exercises of options
  500   (500) 
  
 
 
  
 
 
 
Shares outstanding as of May 31, 2018
  158,319,910   59,477 
  
 
 
  
 
 
 
Reissuance of treasury stock for NES
  59,477   (59,477) 
Issuance of common share for NES
  422,327   —   
Shares repurchase
  (952,000)   952,000 
  
 
 
  
 
 
 
Shares outstanding as of May 31, 2019
  157,849,714   952,000