Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS AND DIVESTITURES - Narrative (Details)

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ACQUISITIONS AND DIVESTITURES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 01, 2018
Feb. 01, 2018
Nov. 28, 2017
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]                
Cash payment to acquire business           $ 1,000 $ 11,504 $ 121,065
Percentage of voting rights sold             51.00%  
Proceeds from sale of ownership interests in subsidiaries         $ 42,210   $ 8,254 0
(Gain) loss on sale of ownership interest in subsidiary         $ 11,208   (6,469) 0
Income (loss) attributable to noncontrolling interest           $ (497) (901) (260)
Frost Converting Systems                
Business Acquisition [Line Items]                
Cash payment to acquire business $ 7,162              
Percentage of voting interests acquired 80.00%              
Memorialization Business                
Business Acquisition [Line Items]                
Cash payment to acquire business       $ 1,000     3,094  
Star Granite Bronze International, Inc                
Business Acquisition [Line Items]                
Cash payment to acquire business   $ 30,961            
Total purchase price of Star Granite and Bronze International, Inc.   35,961            
Shares issued in business acquisition   5,000            
Annual sales of business before acquisition   $ 31,000            
Compass Engineering Group, Inc                
Business Acquisition [Line Items]                
Cash payment to acquire business     $ 51,887          
Annual sales of business before acquisition     $ 24,000          
Series of Individually Immaterial Business Acquisitions                
Business Acquisition [Line Items]                
Cash payment to acquire business               $ 39,465
Memorialization Business                
Business Acquisition [Line Items]                
(Gain) loss on sale of ownership interest in subsidiary             (5,587)  
Income (loss) attributable to noncontrolling interest             $ (882)