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DEBT - Debt activity (Details) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 13, 2016 USD ($) | Mar. 19, 2015 USD ($) | Nov. 13, 2018 USD ($) letter | Sep. 30, 2018 USD ($) letter | Sep. 30, 2017 USD ($)
Debt |  |  |  |  |
Face Amount |  |  |  | $ 500,000,000 | $ 500,000,000
Unsecured senior notes issued March 19, 2015 |  |  |  |  |
Debt |  |  |  |  |
Face Amount |  | $ 500,000,000 |  | $ 500,000,000 | $ 500,000,000
Long-term debt stated interest rate percentage |  | 4.65% |  |  |
Term of debt |  | 10 years |  |  |
2016 Credit Facility |  |  |  |  |
Debt |  |  |  |  |
Maximum borrowing capacity | $ 300,000,000 |  |  |  |
Commitment fee (as a percent) |  |  |  | 0.15% |
Maximum limit of priority debt on net worth |  |  |  | 17.50% |
Borrowing amount outstanding |  |  |  | $ 0 |
Available borrowing capacity |  |  |  | $ 260,700,000 |
2016 Credit Facility | Minimum |  |  |  |  |
Debt |  |  |  |  |
Commitment fee (as a percent) | 0.15% |  |  |  |
2016 Credit Facility | Maximum |  |  |  |  |
Debt |  |  |  |  |
Commitment fee (as a percent) | 0.30% |  |  |  |
Total debt to total capitalization (as a percent) | 50.00% |  |  |  |
2016 Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt |  |  |  |  |
Interest spread on borrowings (as a percent) |  |  |  | 1.125% |
2016 Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |
Debt |  |  |  |  |
Interest spread on borrowings (as a percent) | 1.125% |  |  |  |
2016 Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |
Debt |  |  |  |  |
Interest spread on borrowings (as a percent) | 1.75% |  |  |  |
2016 Credit Facility | Letters of credit |  |  |  |  |
Debt |  |  |  |  |
Maximum borrowing capacity | $ 75,000,000 |  |  |  |
Number of letters of credit outstanding | letter |  |  |  | 3 |
Letters of credit outstanding/issued |  |  |  | $ 39,300,000 |
2016 Credit Facility | Issued to support self-insured losses under high deductible casualty insurance programs |  |  |  |  |
Debt |  |  |  |  |
Number of letters of credit outstanding | letter |  |  |  | 2 |
Letters of credit outstanding/issued |  |  |  | $ 29,300,000 |
2016 Credit Facility | Letter of credit supporting an operating line of credit with a bank in Argentina |  |  |  |  |
Debt |  |  |  |  |
Letters of credit outstanding/issued |  |  |  | 10,000,000 |
2016 Credit Facility | Subsequent Event |  |  |  |  |
Debt |  |  |  |  |
Available borrowing capacity |  |  | $ 262,000,000 |  |
Decrease in credit facility |  |  | $ 300,000,000 |  |
2016 Credit Facility | Subsequent Event | Letters of credit |  |  |  |  |
Debt |  |  |  |  |
Number of letters of credit decreased | letter |  |  | 1 |  |
Decrease in credit facility |  |  | $ 1,300,000 |  |
2018 Credit Facility | Subsequent Event |  |  |  |  |
Debt |  |  |  |  |
Maximum borrowing capacity |  |  | 750,000,000 |  |
Borrowing amount outstanding |  |  | 0 |  |
Letters of credit outstanding/issued |  |  | 3 |  |
Available borrowing capacity |  |  | $ 712,000,000 |  |
2018 Credit Facility | Subsequent Event | Forecast |  |  |  |  |
Debt |  |  |  |  |
Commitment fee (as a percent) |  |  | 0.125% |  |
2018 Credit Facility | Subsequent Event | Minimum |  |  |  |  |
Debt |  |  |  |  |
Commitment fee (as a percent) |  |  | 0.075% |  |
2018 Credit Facility | Subsequent Event | Maximum |  |  |  |  |
Debt |  |  |  |  |
Commitment fee (as a percent) |  |  | 0.20% |  |
Total debt to total capitalization (as a percent) |  |  | 50.00% |  |
2018 Credit Facility | Subsequent Event | London Interbank Offered Rate (LIBOR) | Forecast |  |  |  |  |
Debt |  |  |  |  |
Interest spread on borrowings (as a percent) |  |  | 1.125% |  |
2018 Credit Facility | Subsequent Event | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |
Debt |  |  |  |  |
Interest spread on borrowings (as a percent) |  |  | 0.875% |  |
2018 Credit Facility | Subsequent Event | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |
Debt |  |  |  |  |
Interest spread on borrowings (as a percent) |  |  | 1.50% |  |
2018 Credit Facility | Subsequent Event | Letters of credit |  |  |  |  |
Debt |  |  |  |  |
Maximum borrowing capacity |  |  | $ 75,000,000 |  |
Letters of credit outstanding/issued |  |  | $ 38,000,000 |  |
Unsecured standalone line of credit facility |  |  |  |  |
Debt |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 12,000,000 |

X
- Definition Percentage of total debt to total capitalization of the entity. + References No definition available. + Details
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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 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 The number of letters of credit that were decreased. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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 total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount of increase (decrease) of the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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