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v3.23.3

Short-Term Borrowings and Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Mortgage Facility [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 2.20% |
Mortgage Facility [Member] | Mortgage Facility Payable to Flagship Bank [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 7.50% | 5.25%
Debt instrument basis percentage | 1.00% | 1.00%
Principal and interest payments with a balloon payment | $ 4.0 | $ 4.0
Additional extension for two one-year periods | Aug. 31, 2027 | Aug. 31, 2027
Mortgage Facility [Member] | Mortgage Facility Payable to Flagship Bank [Member] | Interest Rate Prime [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument description of variable rate basis | (prime minus 100 basis points with a floor of 2.00 | (prime minus 100 basis points with a floor of 2.00
Mortgage Facility [Member] | Mortgage Facility Payable to Flagship Bank [Member] | Interest Rate Floor [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 2.00% | 2.00%
Mortgage Facility [Member] | Mortgage Facility Payable to Seacoast National Bank [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 7.88% | 5.63%
Debt instrument basis percentage |  | 0.625%
Principal and interest payments with a balloon payment | $ 10.0 | $ 6.0
Additional extension for two one-year periods | Aug. 31, 2027 | Sep. 30, 2031
Mortgage Facility [Member] | Mortgage Facility Payable to Seacoast National Bank [Member] | Interest Rate Prime [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument description of variable rate basis |  | (greater of 3.00% or prime minus 62.5 basis points
Mortgage Facility [Member] | Mortgage Facility Payable to Seacoast National Bank [Member] | SOFR [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument basis percentage | 220.00% |
Debt instrument description of variable rate basis | (SOFR plus 220 basis points). Requires monthly interest payments |
Mortgage Facility [Member] | Mortgage facility payable to Hancock Whitney Bank [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 7.88% | 5.63%
Debt instrument basis percentage | 0.625% | 0.625%
Principal and interest payments with a balloon payment | $ 15.5 | $ 15.5
Additional extension for two one-year periods | Nov. 30, 2027 | Nov. 30, 2027
Percentage of outstanding borrowings hedged | 50.00% | 50.00%
Fixed interest rate | 3.20% | 3.20%
Mortgage Facility [Member] | Mortgage facility payable to Hancock Whitney Bank [Member] | Interest Rate Prime [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument description of variable rate basis | (prime minus 62.5 basis points with a floor of 2.25 | (prime minus 62.5 basis points with a floor of 2.25
Mortgage Facility [Member] | Mortgage facility payable to Hancock Whitney Bank [Member] | Interest Rate Floor [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 2.25% | 2.25%
Mortgage Facility [Member] | Revolving mortgage facility with FineMark National Bank & Trust [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 8.25% | 6.00%
Debt instrument basis percentage | 0.25% | 0.25%
Additional extension for two one-year periods |  | Oct. 31, 2027
Current available borrowings | $ 22.7 | $ 24.5
Mortgage Facility [Member] | Revolving mortgage facility with FineMark National Bank & Trust [Member] | Base Rate [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument description of variable rate basis | (prime minus 25 basis points with a floor of 3.00 | (prime minus 25 basis points with a floor of 3.00
Mortgage Facility [Member] | Revolving mortgage facility with FineMark National Bank & Trust [Member] | Interest Rate Floor [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 3.00% | 3.00%
Term Loan [Member] | Term loan payable to M&T Bank [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 6.83% |
Additional extension for two one-year periods | Aug. 31, 2027 |
Term Loan [Member] | Loan payable to TRANSPORT S.a.s di Taula Vittorio and C. [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 7.08% |
Additional extension for two one-year periods | Dec. 31, 2030 |

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