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v3.21.1

Short-Term Borrowings and Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) - Mortgage Facility [Member] - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
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% or prime minus 62.5 basis points |
Mortgage facility payable to Hancock Whitney Bank [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 2.60% |
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 |  | $ 26.4
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% |
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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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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