XML 116 R86.htm IDEA: XBRL DOCUMENT v3.21.2
GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Intangible Assets [Line Items]      
Write-off from impairment of goodwill $ 0 $ 0 $ 116,000,000.0
Write-off from impairment of intangible assets 0 24,200,000 35,400,000
Amortization of intangible assets $ 65,100,000 55,300,000 70,800,000
Coevorden Operations      
Intangible Assets [Line Items]      
Impairment loss recognized on definite-lived tangible assets   7,600,000  
Coevorden Operations | Tradenames      
Intangible Assets [Line Items]      
Write-off from impairment of intangible assets   $ 16,600,000  
HPC      
Intangible Assets [Line Items]      
Write-off from impairment of goodwill     116,000,000
Amortization of intangible assets     15,500,000
HPC | Tradenames      
Intangible Assets [Line Items]      
Write-off from impairment of intangible assets     18,800,000
GPC | Tradenames      
Intangible Assets [Line Items]      
Write-off from impairment of intangible assets     $ 16,600,000