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Short-Term Borrowings and Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) - Mortgage Facility [Member] $ in Millions | 9 Months Ended
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Jun. 30, 2021 USD ($)
Mortgage Facility Payable to Flagship Bank [Member] |
Debt Instrument [Line Items] |
Debt instrument interest rate | 2.25%
Debt instrument basis percentage | 1.00%
Principal and interest payments with a balloon payment | $ 4.0
Additional extension for two one-year periods | Aug. 31, 2027
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%
Mortgage Facility Payable to Flagship Bank [Member] | Interest Rate Floor [Member] |
Debt Instrument [Line Items] |
Debt instrument interest rate | 2.00%
Mortgage Facility Payable to Seacoast National Bank [Member] |
Debt Instrument [Line Items] |
Debt instrument interest rate | 3.00%
Debt instrument basis percentage | 0.625%
Principal and interest payments with a balloon payment | $ 6.0
Additional extension for two one-year periods | Sep. 30, 2031
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 payable to Hancock Whitney Bank [Member] |
Debt Instrument [Line Items] |
Debt instrument interest rate | 2.63%
Debt instrument basis percentage | 0.625%
Principal and interest payments with a balloon payment | $ 15.5
Additional extension for two one-year periods | Nov. 30, 2027
Percentage of outstanding borrowings hedged | 50.00%
Fixed interest rate | 3.20%
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%
Mortgage facility payable to Hancock Whitney Bank [Member] | Interest Rate Floor [Member] |
Debt Instrument [Line Items] |
Debt instrument interest rate | 2.25%
Revolving mortgage facility with FineMark National Bank & Trust [Member] |
Debt Instrument [Line Items] |
Debt instrument interest rate | 3.00%
Debt instrument basis percentage | 0.25%
Additional extension for two one-year periods | Sep. 30, 2027
Current available borrowings | $ 26.1
Revolving mortgage facility with FineMark National Bank & Trust [Member] | Interest Rate Base [Member] |
Debt Instrument [Line Items] |
Debt instrument description of variable rate basis | base minus 25 basis points with a floor of 3.00%
Revolving mortgage facility with FineMark National Bank & Trust [Member] | Interest Rate Floor [Member] |
Debt Instrument [Line Items] |
Debt instrument interest rate | 3.00%

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