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Borrowing Arrangements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2021
Jun. 30, 2023
Sep. 30, 2022
Jun. 30, 2022
May 28, 2021
Long-term Debt, Gross $ 451.6   $ 451.6 $ 451.6    
Outstanding letter of credit accrued fees and expenses 0.2   0.2      
Cash and cash equivalents         $ 154.9  
Future maturities of outstanding borrowings            
Outstanding letters of credit 12.5   12.5      
Domestic Line of Credit [Member]            
Revolving credit facility amount (175.0)   (175.0)      
Future maturities of outstanding borrowings            
Line of Credit Facility, Maximum Borrowing Capacity $ 175.0   175.0      
Potential increase size of the credit facility by an additional amount     $ 150.0      
Line of Credit Facility, Borrowing Base, Percentage of Eligible Accounts Receivable 85.00%   85.00%      
Line of Credit Facility, Borrowing Base, Percentage of Eligible Inventory 70.00%   70.00%      
Line of Credit Facility, Borrowing Base, Percentage of Net Orderly Liquidation Value of Eligible Inventory 85.00%   85.00%      
Line of Credit Facility, Covenant, Percent of Loan Cap 10.00%   10.00%      
Unsecured Debt [Member]            
Long-term Debt, Gross           $ 450.0
Future maturities of outstanding borrowings            
Payments of debt issuance costs   $ 5.5        
Swing Line Loans [Member]            
Revolving credit facility amount $ (25.0)   $ (25.0)      
Future maturities of outstanding borrowings            
Line of Credit Facility, Maximum Borrowing Capacity 25.0   25.0      
Letters Of Credit Outstanding [Member]            
Revolving credit facility amount (60.0)   (60.0)      
Future maturities of outstanding borrowings            
Line of Credit Facility, Maximum Borrowing Capacity $ 60.0   $ 60.0      
5.5% Senior Notes            
Debt Instrument, Interest Rate, Effective Percentage 4.00%   4.00%      
Future maturities of outstanding borrowings            
Financial Liabilities Fair Value Disclosure $ 400.7   $ 400.7      
Debt Instrument, Redemption Price, Percentage     40.00%      
Debt Instrument, Redemption Price Upon Change In Control, Percentage     101.00%      
Revolving Credit Facility            
Excess availability reduced by outstanding borrowings, outstanding letters of credit and accrued fees and expenses 162.3   $ 162.3      
Future maturities of outstanding borrowings            
Aggregate commitments availability     17.5      
Line of Credit Facility, Remaining Borrowing Capacity $ 162.3   $ 162.3      
Minimum [Member] | Domestic Line of Credit [Member]            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.375%      
Base Rate [Member] | Domestic Line of Credit [Member]            
Line of Credit Facility, Interest Rate at Period End 1.00%   1.00%      
Base Rate [Member] | Minimum [Member] | Domestic Line of Credit [Member]            
Debt Instrument, Basis Spread on Variable Rate     1.00%      
Base Rate [Member] | Maximum [Member] | Domestic Line of Credit [Member]            
Debt Instrument, Basis Spread on Variable Rate     1.25%      
Secured Overnight Financing Rate | Domestic Line of Credit [Member]            
Debt Instrument, Basis Spread on Variable Rate 0.10%          
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Domestic Line of Credit [Member]            
Line of Credit Facility, Interest Rate at Period End 2.00%   2.00%      
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum [Member] | Domestic Line of Credit [Member]            
Debt Instrument, Basis Spread on Variable Rate     2.00%      
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum [Member] | Domestic Line of Credit [Member]            
Debt Instrument, Basis Spread on Variable Rate     2.25%