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ACQUISITIONS - Narrative (Details)
9 Months Ended
Jun. 04, 2021
USD ($)
May 31, 2021
USD ($)
Jan. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
acquisition
Sep. 30, 2020
acquisition
Business Acquisition [Line Items]          
Goodwill, expected to provide a tax benefit       $ 0  
Number of Acquisitions | acquisition       3 0
Premium foam and bedding manufacturer          
Business Acquisition [Line Items]          
Purchase price $ 119,700,000        
Goodwill acquired $ 62,000,000.0        
Polish manufacturer          
Business Acquisition [Line Items]          
Purchase price   $ 5,400,000      
Goodwill acquired   $ 4,400,000      
UK manufacturer          
Business Acquisition [Line Items]          
Purchase price     $ 27,700,000    
Goodwill acquired     $ 10,500,000