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BORROWINGS - Notes Payable Narrative (Details) - USD ($) | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Oct. 31, 2019 | Mar. 31, 2023 | Mar. 31, 2022 | Sep. 30, 2022 | Nov. 04, 2021 | Nov. 01, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 200,000,000 | $ 200,000,000 |  |  |
Proceeds from issuance of notes payable |  |  |  |  | 0 | $ 50,000,000 |  |  |
Interest payable |  |  |  |  | 2,779,000 |  | $ 2,517,000 |  |
Notes Payable | 3.75% Notes due 2027 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 50,000,000 |  |  |  |  |  |  |  |
Interest rate | 3.75% |  |  |  |  |  |  | 3.75% |
Proceeds from issuance of notes payable | $ 48,500,000 |  |  |  |  |  |  |  |
Interest payable | $ 1,900,000 |  |  |  |  |  |  |  |
Notes payable, fair value disclosure |  |  |  |  | 45,500,000 |  |  |  |
Notes Payable | 5.125% Notes due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 50,000,000 | $ 100,000,000 |  |  |  |  |  |
Interest rate |  |  | 5.125% |  |  |  |  |  |
Proceeds from issuance of notes payable |  | $ 50,600,000 | $ 97,700,000 |  |  |  |  |  |
Interest payable |  |  | $ 7,700,000 |  |  |  |  |  |
Notes payable, fair value disclosure |  |  |  |  | $ 145,500,000 |  |  |  |
Notes Payable | 5.375% Notes due 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 38,800,000 |  |  |  |  | $ 38,800,000
Interest rate |  |  |  | 5.375% |  |  |  |  |
Proceeds from issuance of notes payable |  |  |  | $ 37,500,000 |  |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: 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)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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