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BUSINESS COMBINATION - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Nov. 15, 2018
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Business Acquisition [Line Items]            
Acquisition of business, net of cash acquired         $ 0 $ 1,182,186,000
Asset impairment     $ 67,372,000      
Goodwill   $ 709,823,000 710,071,000   709,823,000  
Share-based compensation expense         8,997,000 11,708,000
Non-cash charge on inventory step up of acquired inventory sold   0   $ 4,566,000 0 14,827,000
Revolving credit facility | Credit Agreement | JPMorgan Chase Bank, N.A.            
Business Acquisition [Line Items]            
Debt, term 7 years          
Electronic Materials            
Business Acquisition [Line Items]            
Goodwill   353,262,000 352,797,000   353,262,000  
Performance Materials            
Business Acquisition [Line Items]            
Goodwill   356,561,000 $ 357,274,000   356,561,000  
Term loan facility | Revolving credit facility | Credit Agreement            
Business Acquisition [Line Items]            
Debt, term 7 years          
Term loan facility | Revolving credit facility | Credit Agreement | JPMorgan Chase Bank, N.A.            
Business Acquisition [Line Items]            
Debt, term 7 years          
Debt, face amount $ 1,065,000,000.0          
KMG            
Business Acquisition [Line Items]            
Business acquisition, percentage of voting interest acquired 100.00%          
Acquisition of business, net of cash acquired $ 1,513,235,000          
Consideration transferred 1,536,452,000          
Cash acquired from acquisition $ 23,217,000          
Amount received for each share of KMG common stock (in dollars per share) $ 55.65          
Share percentage received for each share of KMG common stock (in shares) 0.2000          
Shares issued to acquire entity (in shares) 3,237,005          
Share price of shares issued to acquire entity (in dollars per share) $ 102.27          
Weighted average useful life 17 years 10 months 24 days          
Goodwill $ 613,334,000          
Transaction costs   117,000     323,000  
Net sales   137,996,000     271,429,000  
Net income   16,604,000     31,290,000  
KMG | Acquisition-related costs            
Business Acquisition [Line Items]            
Transaction costs       621,000   1,436,000
Share-based compensation expense       $ 51,000   $ 154,000
KMG | Selling, general and administrative            
Business Acquisition [Line Items]            
Transaction costs   $ 2,285,000     $ 5,050,000  
KMG | Electronic Materials            
Business Acquisition [Line Items]            
Goodwill 259,859,000          
KMG | Performance Materials            
Business Acquisition [Line Items]            
Goodwill $ 353,475,000