Short-Term Borrowings and Long-Term Debt - Additional Information (Detail) - USD ($) |
1 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Sep. 30, 2025 |
|
| Line Of Credit Facility [Line Items] | ||||
| Unamortized debt issuance costs | $ 2,200,000 | $ 2,200,000 | $ 900,000 | |
| Interest rate on floor plan facility | 3.25% | |||
| Mortgage Facility [Member] | ||||
| Line Of Credit Facility [Line Items] | ||||
| Debt instrument interest rate | 2.20% | 2.20% | ||
| Long-term debt | $ 364,363,000 | $ 364,363,000 | $ 393,196,000 | |
| Delayed Draw Mortgage Loan Facility [Member] | ||||
| Line Of Credit Facility [Line Items] | ||||
| Short term borrowings outstanding | 30,600,000 | |||
| Borrowing Base Amount and Aging Inventory [Member] | ||||
| Line Of Credit Facility [Line Items] | ||||
| Inventory and working capital needs | $ 608,300,000 | $ 608,300,000 | $ 735,200,000 | |
| Interest rate on short-term borrowings | 7.10% | 7.80% | ||
| Revolving Credit Facility [Member] | Minimum [Member] | ||||
| Line Of Credit Facility [Line Items] | ||||
| Debt instrument interest rate | 1.50% | 1.50% | ||
| Revolving Credit Facility [Member] | Maximum [Member] | ||||
| Line Of Credit Facility [Line Items] | ||||
| Debt instrument interest rate | 2.00% | 2.00% | ||
| Term Loan Facility | Minimum [Member] | ||||
| Line Of Credit Facility [Line Items] | ||||
| Debt instrument interest rate | 1.50% | 1.50% | ||
| Term Loan Facility | Maximum [Member] | ||||
| Line Of Credit Facility [Line Items] | ||||
| Debt instrument interest rate | 2.00% | 2.00% | ||
| New Credit Facility [Member] | ||||
| Line Of Credit Facility [Line Items] | ||||
| Amount of borrowing availability | $ 950,000,000 | $ 950,000,000 | ||
| Leverage ratio | 3.50% | 3.50% | ||
| Debt instrument, covenant compliance | The covenants include provisions that our leverage ratio must not exceed 3.50 to 1.00 and that our consolidated fixed charge coverage ratio must be greater than 1.10 to 1.00. As of June 30, 2026, we were in compliance with all covenants under the New Credit Facility. The New Credit Facility is secured by the Company’s personal property assets, including inventory and related accounts receivable. The mortgage loans will also be secured by the real estate pledged as collateral for such loans. | |||
| Additional borrowings | $ 2,000,000 | |||
| Credit facility interest rate description | The interest rate is (a) for amounts outstanding under the Floor Plan, 3.25% above the one month secured term rate as administered by the CME Group Benchmark Administration Limited (CBA) (“SOFR”), (b) for amounts outstanding under the revolving credit facility or the term loan facility, a range of 1.50% to 2.0%, depending on the total net leverage ratio, above the one month, three month, or six month term SOFR rate, and (c) for amounts outstanding under the mortgage loan facility, 2.20% above the one month, three month, or six month term SOFR rate. The alternate base rate with a margin is available for amounts outstanding under the revolving credit, term, and mortgage loan facilities, and the Euro Interbank Offered Rate plus a margin is available for borrowings in Euro under the revolving credit facility. Borrowings, in any, in other currencies approved as alternative currencies under the revolving credit facility bear interest at a separately designated benchmark rate plus a margin, as approved by the administrative agent and the lenders in connection with the approval of such currency. | |||
| New Credit Facility [Member] | Delayed Draw Term Loan Facility | ||||
| Line Of Credit Facility [Line Items] | ||||
| Long term debt maturity | 2031-06 | |||
| New Credit Facility [Member] | Delayed Draw Mortgage Loan Facility [Member] | ||||
| Line Of Credit Facility [Line Items] | ||||
| Amount of borrowing availability | $ 54,000,000 | $ 54,000,000 | ||
| Long term debt maturity | 2031-06 | |||
| New Credit Facility [Member] | Maximum [Member] | ||||
| Line Of Credit Facility [Line Items] | ||||
| Fixed coverage ratio | 110 | |||
| New Credit Facility [Member] | Revolving Credit Facility [Member] | ||||
| Line Of Credit Facility [Line Items] | ||||
| Amount of borrowing availability | $ 150,000,000 | $ 150,000,000 | ||
| Remaining borrowing capacity | 136,000,000 | 136,000,000 | ||
| Swingline facility | 20,000,000 | 20,000,000 | ||
| Letter of credit sublimit amount | 20,000,000 | 20,000,000 | ||
| Letter of Credit [Member] | ||||
| Line Of Credit Facility [Line Items] | ||||
| Letters of credit for insurance carriers and equity investment | $ 14,400,000 | $ 14,400,000 | ||