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DEBT - Narrative (Details) |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 15, 2019 | Nov. 13, 2018 USD ($) | Sep. 30, 2019 USD ($) number_of_letters_of_credit | Oct. 31, 2019 USD ($) | Sep. 27, 2019 USD ($) | Dec. 20, 2018 USD ($) | Nov. 19, 2018 USD ($) | Sep. 30, 2018 USD ($) | Mar. 19, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 479,356,000 |  |  |  |  | $ 493,968,000 |
Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Number of letters of credit outstanding | number_of_letters_of_credit |  |  | 2 |  |  |  |  |  |
Line of Credit | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | $ 24,800,000 |  |  |  |  |
HPIDC 2025 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 4.65%
Aggregate principal amount |  |  |  |  | $ 12,900,000 | $ 12,900,000 |  |  |
Debt redemption amount |  |  |  |  | $ 14,600,000 |  |  |  |
HPIDC 2025 Notes | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 500,000,000
Company 2025 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 487,100,000 |  |  |
Interest rate |  |  |  |  |  |  | 4.65% |  |
Percent of notes exchanged | 99.99% |  |  |  |  |  |  |  |
Company 2025 Notes | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  | $ 500,000,000 |  |
2018 Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 750,000,000 |  |  |  |  |  |  |
Increase in aggregate commitments subject to satisfaction of certain commitments from new or existing lenders |  | $ 300,000,000 |  |  |  |  |  |  |
Commitment fee rate |  |  | 0.125% |  |  |  |  |  |
Maximum limit of priority debt on net worth |  | 17.50% |  |  |  |  |  |  |
Borrowings outstanding |  |  | $ 0 |  |  |  |  |  |
Available borrowing capacity |  |  | $ 750,000,000.0 |  |  |  |  |  |
2018 Credit Facility | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee rate |  | 0.075% |  |  |  |  |  |  |
2018 Credit Facility | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee rate |  | 0.20% |  |  |  |  |  |  |
Total debt to total capitalization ratio |  | 50.00% |  |  |  |  |  |  |
2018 Credit Facility | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate spread |  |  | 1.125% |  |  |  |  |  |
2018 Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate spread |  | 0.875% |  |  |  |  |  |  |
2018 Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate spread |  | 1.50% |  |  |  |  |  |  |
2018 Credit Facility | Letters of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 75,000,000 |  |  |  |  |  |  |
Unsecured Credit Facility Dated as of July 13, 2016 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amount of credit facility terminated |  | $ 300,000,000.0 |  |  |  |  |  |  |
Letter of Credit - Instrument 1 | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  | $ 25,500,000 |  |  |  |  |  |
Letter of Credit - Instrument 2 | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  | 2,100,000 |  |  |  |  |  |
Unsecured Standalone Line of Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | 11,500,000 |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 20,000,000.0 |  |  |  |  |  |

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- Definition The contingent increase above the maximum borrowing capacity under the credit facility, if any one or more of the existing banks or new banks agree to provide such increased commitment amount. + References No definition available. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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 http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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