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Short-Term Borrowings and Long-Term Debt - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2023 | Aug. 31, 2022 | Sep. 30, 2024 | Sep. 30, 2023
Line Of Credit Facility [Line Items] |  |  |  |
Unamortized debt issuance costs |  |  | $ 1,300,000 | $ 1,600,000
Long-term debt, net of current maturities |  |  | $ 355,906,000 | 389,231,000
Interest rate on floor plan facility |  |  | 3.45% |
Long-term debt |  |  | $ 391,186,000 |
Letter of Credit [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Letters of credit for insurance carriers and equity investment |  |  | $ 14,100,000 |
Mortgage Facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Debt instrument interest rate |  |  | 2.20% |
Long-term debt |  |  | $ 391,186,000 | 424,899,000
Borrowing Base Amount and Aging Inventory [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Inventory and working capital needs |  |  | $ 709,000,000 | $ 537,100,000
Interest rate on short-term borrowings |  |  | 8.70% | 8.80%
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Debt instrument interest rate |  |  | 1.50% |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Debt instrument interest rate |  |  | 2.00% |
Term Loan Facility | Minimum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Debt instrument interest rate |  |  | 1.50% |
Term Loan Facility | Maximum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Debt instrument interest rate |  |  | 2.00% |
New Credit Agreement [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Amount of borrowing availability |  | $ 750,000,000 |  |
New Credit Agreement [Member] | Delayed Draw Term Loan Facility |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Long term debt maturity |  | 2027-08 |  |
New Credit Agreement [Member] | Delayed Draw Mortgage Loan Facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Long term debt maturity |  | 2027-08 |  |
Long-term debt |  | $ 100,000,000 |  |
New Credit Agreement [Member] | Maximum [Member] | Delayed Draw Term Loan Facility |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Long-term debt |  | 400,000,000 |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Amount of borrowing availability |  | 100,000,000 |  |
Swingline facility |  | 20,000,000 |  |
Letter of credit sublimit amount |  | $ 20,000,000 |  |
Amended Credit Facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Amount of borrowing availability | $ 950,000,000 |  |  |
Leverage ratio |  |  | 3.35% |
Debt instrument, covenant compliance |  |  | The covenants include provisions that our leverage ratio must not exceed 3.35 to 1.0 and that our consolidated fixed charge coverage ratio must be greater than 1.10 to 1.0. As of September 30, 2024, we were in compliance with all covenants under the Amended Credit Agreement. The Amended Credit Agreement 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 |  |  | $ 1,500,000 |
Credit facility interest rate description |  |  | The interest rate is (a) for amounts outstanding under the Floor Plan, 3.45% 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 or other currencies other than dollars under the revolving credit facility. |
Amended Credit Facility [Member] | Delayed Draw Term Loan Facility |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Long term debt maturity | 2027-08 |  |  |
Amended Credit Facility [Member] | Delayed Draw Mortgage Loan Facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Amount of borrowing availability |  |  | $ 100,000,000 |
Long term debt maturity | 2027-08 |  |  |
Long-term debt | $ 100,000,000 |  |  |
Amended Credit Facility [Member] | Maximum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Fixed coverage ratio |  |  | 110 |
Amended Credit Facility [Member] | Maximum [Member] | Delayed Draw Term Loan Facility |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Long-term debt | 400,000,000 |  |  |
Amended Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Amount of borrowing availability | 100,000,000 |  | $ 86,000,000 |
Swingline facility | 20,000,000 |  |  |
Letter of credit sublimit amount | $ 20,000,000 |  |  |

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-14 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-9 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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