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BUSINESS COMBINATION (Tables)
 9 Months Ended
Jun. 30, 2020
Business Combinations [Abstract]  
Summary of pro forma information
The following unaudited supplemental pro forma information summarizes the combined results of operations for Cabot Microelectronics and KMG as if the Acquisition had occurred on October 1, 2017.
Nine Months Ended
June 30, 2019
Revenue$821,029  
Net income80,618  
Earnings per share - basic2.79  
Earnings per share - diluted2.74