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Short-Term Borrowings and Long-Term Debt - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jul. 31, 2021
May 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Line Of Credit Facility [Line Items]        
Additional borrowings     $ 79,000,000.0  
Unamortized debt issuance costs     200,000  
Long-term debt, net of current maturities     47,498,000 $ 7,343,000
Mortgage Facility [Member]        
Line Of Credit Facility [Line Items]        
Long-term debt, net of current maturities     $ 7,400,000  
Minimum [Member]        
Line Of Credit Facility [Line Items]        
Current ratio     1.20%  
Borrowing Base Amount and Aging Inventory [Member]        
Line Of Credit Facility [Line Items]        
Inventory and working capital needs     $ 24,100,000  
Interest rate on short-term borrowings     4.20% 4.20%
Credit Facility [Member]        
Line Of Credit Facility [Line Items]        
Line of credit facility, term 1 year      
Amount of borrowing availability $ 500,000,000.0      
Line of Credit Facility, Description     the Company amended its Credit Facility to increase the borrowing availability to $500.0 million, extend the term to expire by one year to July 2024, with two one-year options to renew, subject to lender approval, and modify certain provisions to provide additional liquidity to the Company.  
Additional extension for two one-year periods Jul. 31, 2024 Jul. 31, 2024    
Interest rate for amounts outstanding under the Credit Facility     3.45%  
Credit Facility [Member] | Borrowing Base Amount and Aging Inventory [Member]        
Line Of Credit Facility [Line Items]        
Amount of borrowing availability   $ 500,000,000.0    
Line of Credit Facility, Description     The Credit Facility expires in July 2024, subject to extension for two one-year periods, with lender approval  
Leverage ratio     2.75%  
Credit Facility interest rate description     The interest rate for amounts outstanding under the Credit Facility is 345 basis points plus the greater of 75 basis points or the one-month LIBOR.  
Debt instrument, covenant compliance     The covenants include provisions that our leverage ratio must not exceed 2.75 to 1.0 and that our current ratio must be greater than 1.2 to 1.0.  
Interest rate for amounts outstanding under the Credit Facility     0.75%  
Unused line fee on the unused portion of the amended Credit Facility     0.10%  
New inventory mature date     1080 days  
Used inventory maturity period     361 days  
Real estate property pledged for collateral     $ 0