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DEBT - Narrative (Details) |  |  |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 15, 2019 | Nov. 19, 2018 USD ($) | Nov. 13, 2018 USD ($) | Mar. 19, 2015 USD ($) | Jun. 30, 2019 USD ($) debt_instrument number_of_letters_of_credit | Dec. 31, 2018 USD ($) | Dec. 20, 2018 USD ($) | Sep. 30, 2018 USD ($)
Debt |  |  |  |  |  |  |  |
Debt issued (up to) |  |  |  |  | $ 500,000,000 |  |  |
Debt outstanding |  |  |  |  | $ 491,651,000 |  |  | $ 493,968,000
Number of letters of credit outstanding | number_of_letters_of_credit |  |  |  |  | 2 |  |  |
HPIDC 2025 Notes |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Debt issued (up to) |  |  |  | $ 500,000,000 |  |  |  |
Long-term debt stated interest rate percentage |  |  |  | 4.65% |  |  |  |
Term of debt |  |  |  | 10 years |  |  |  |
Debt outstanding |  |  |  |  | $ 491,651,000 | $ 12,900,000 | $ 12,900,000 | $ 493,968,000
2018 Credit Facility |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 750,000,000 |  |  |  |  |
Contingent increase |  |  | $ 300,000,000 |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  | 0.125% |  |  |
Maximum limit of priority debt on net worth |  |  | 17.50% |  |  |  |  |
Borrowing amount outstanding |  |  |  |  | $ 0 |  |  |
Available borrowing capacity |  |  |  |  | $ 740,000,000.0 |  |  |
2018 Credit Facility | Minimum |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  | 0.075% |  |  |  |  |
2018 Credit Facility | Maximum |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  | 0.20% |  |  |  |  |
Total debt to total capitalization (as a percent) |  |  | 50.00% |  |  |  |  |
2018 Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Interest spread on borrowings (as a percent) |  |  |  |  | 1.125% |  |  |
2018 Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Interest spread on borrowings (as a percent) |  |  | 0.875% |  |  |  |  |
2018 Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Interest spread on borrowings (as a percent) |  |  | 1.50% |  |  |  |  |
2018 Credit Facility | Letter of Credit |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 75,000,000 |  |  |  |  |
Number of letters of credit outstanding | debt_instrument |  |  |  |  | 1 |  |  |
Letters of credit outstanding/issued |  |  |  |  | $ 10,000,000.0 |  |  |
2016 Credit Facility |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Decrease in credit facility |  |  | $ 300,000,000 |  |  |  |  |
Unsecured Standalone Line of Credit Facility |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 12,000,000.0 |  |  |
Company 2025 Notes |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Debt issued (up to) |  |  |  |  |  | $ 487,100,000 | $ 487,100,000 |
Long-term debt stated interest rate percentage |  | 4.65% |  |  |  |  |  |
Term of debt |  | 10 years |  |  |  |  |  |
Percentage of notes exchanged | 99.99% |  |  |  |  |  |  |
Company 2025 Notes | Maximum |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Debt issued (up to) |  | $ 500,000,000.0 |  |  |  |  |  |
Bilateral Line of Credit with Bank, One |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Letters of credit outstanding/issued |  |  |  |  | 25,500,000 |  |  |
Bilateral Line of Credit with Bank, Two |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Letters of credit outstanding/issued |  |  |  |  | $ 2,100,000 |  |  |

X
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- Definition Represents the number of letters of credit outstanding as of balance sheet date. + References No definition available. + Details
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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 Represents the maximum percentage of priority debt that can be allowed on the net worth of the entity. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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)(3) -URI http://asc.fasb.org/extlink&oid=109500613&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(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: 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 4: 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 + Details
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