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Short-Term Borrowings and Long-Term Debt - Additional Information (Detail) - USD ($)
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
May 31, 2020
Line Of Credit Facility [Line Items]      
Additional borrowings $ 133,400,000    
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 $ 163,400,000    
Interest rate on short-term borrowings 4.20% 5.60%  
Credit Facility [Member]      
Line Of Credit Facility [Line Items]      
Additional extension for two one-year periods May 31, 2023    
Line of credit facility, term 3 years    
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     $ 440,000,000
Line of Credit Facility, Description The Credit Facility has a three-year term and expires in May 2023, 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