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BUSINESS COMBINATIONS (Estimated Fair Values of Assets Acquired and Liabilities Assumed) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Feb. 05, 2018
Nov. 01, 2017
Sep. 30, 2017
Business Acquisition [Line Items]          
Goodwill $ 805,285 $ 813,887     $ 838,669
Sao Judas Tadeu [Member]          
Business Acquisition [Line Items]          
Current Assets       $ 558  
Property and Equipment       64  
Other Long-term Assets       9  
Intangible Assets       381  
Goodwill       5,636  
Total Assets Acquired       6,648  
Liabilities Assumed       684  
Net Assets Acquired       $ 5,964  
Edupristine [Member]          
Business Acquisition [Line Items]          
Current Assets     $ 866    
Property and Equipment     239    
Other Long-term Assets     69    
Intangible Assets     1,380    
Goodwill     11,527    
Total Assets Acquired     14,081    
Liabilities Assumed     2,715    
Net Assets Acquired     $ 11,366