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DEBT - ABL Credit Facility - Narrative (Details) - Amended ABL Credit Facility - USD ($)
Mar. 24, 2023
May 26, 2021
Sep. 30, 2024
Sep. 30, 2023
Domestic Line of Credit | LIBOR | Minimum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate   1.25%    
Domestic Line of Credit | LIBOR | Maximum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate   1.75%    
Domestic Line of Credit | Alternate Base Rate | Minimum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate   0.25%    
Domestic Line of Credit | Alternate Base Rate | Maximum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate   0.75%    
Domestic Line of Credit | Secured Overnight Financing Rate SOFR        
Debt Instrument [Line Items]        
Credit spread adjustment 0.10%      
Domestic Line of Credit | Secured Overnight Financing Rate SOFR | Minimum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 1.25%      
Domestic Line of Credit | Secured Overnight Financing Rate SOFR | Maximum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 1.75%      
Foreign Line of Credit | Line Of Credit Facility, Commitment Option One        
Debt Instrument [Line Items]        
Line of credit facility, unused capacity, commitment fee percentage   0.375%    
Foreign Line of Credit | Line Of Credit Facility, Commitment Option Two        
Debt Instrument [Line Items]        
Line of credit facility, unused capacity, commitment fee percentage   0.30%    
Foreign Line of Credit | Line Of Credit Facility, Commitment Option Three        
Debt Instrument [Line Items]        
Line of credit facility, unused capacity, commitment fee percentage   0.25%    
Foreign Line of Credit | Bankers Acceptance Rate | Minimum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate   1.25%    
Foreign Line of Credit | Bankers Acceptance Rate | Maximum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate   1.75%    
Foreign Line of Credit | Prime Rate | Minimum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate   0.25%    
Foreign Line of Credit | Prime Rate | Maximum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate   0.75%    
Line of Credit | Secured Debt        
Debt Instrument [Line Items]        
Debt instrument, extended term, period from amendment date   5 years    
Debt instrument, extended term, period prior to maturity date   91 days    
Line of credit facility, term, outstanding obligations threshold amount   $ 100,000,000    
Atkore International | Line of Credit        
Debt Instrument [Line Items]        
Aggregate commitments     $ 325,000,000  
Credit availability     $ 325,000,000 $ 322,406,000
Borrowing base percentage of eligible accounts receivable (%)     85.00%  
Borrowing base percentage of eligible inventory (plus) (%)     80.00%  
Debt instrument, covenant, borrowing base, percentage of inventory subject to certain limitations (%)     85.00%  
Borrowings outstanding     $ 0 $ 0