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Debt (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 4 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 19, 2015 USD ($) | Feb. 02, 2018 USD ($) item | Dec. 31, 2017 USD ($) letter item | Feb. 02, 2018 USD ($) | Sep. 30, 2017 USD ($)
Debt |  |  |  |  |
Unsecured long-term debt |  |  | $ 500,000 |  | $ 500,000
Long-term debt |  |  | 500,000 |  | 500,000
Unamortized discount and debt issuance costs |  |  | (6,832) |  | (7,098)
Unamortized discount and debt issuance costs, noncurrent |  |  | (6,832) |  | (7,098)
Unsecured senior notes issued March 19, 2015 |  |  |  |  |
Debt |  |  |  |  |
Unsecured long-term debt |  |  | 500,000 |  | 500,000
Unamortized discount and debt issuance costs |  |  | (6,832) |  | $ (7,098)
Debt issued | $ 500,000 |  | 500,000 |  |
Long-term debt stated interest rate percentage | 4.65% |  |  |  |
Term of debt | 10 years |  |  |  |
Unsecured revolving credit facility mature on July 13, 2021 |  |  |  |  |
Debt |  |  |  |  |
Borrowing capacity |  |  | $ 300,000 |  |
Commitment fee (as a percent) |  |  | 0.15% |  |
Financial covenants | item |  |  | 1 |  |
Maximum limit of priority debt on net worth |  |  | 17.50% |  |
Borrowing amount outstanding |  |  | $ 0 |  |
Available borrowing capacity |  |  | $ 260,700 |  |
Unsecured revolving credit facility mature on July 13, 2021 | Minimum |  |  |  |  |
Debt |  |  |  |  |
Commitment fee (as a percent) |  |  | 0.15% |  |
Unsecured revolving credit facility mature on July 13, 2021 | Maximum |  |  |  |  |
Debt |  |  |  |  |
Commitment fee (as a percent) |  |  | 0.30% |  |
Funded leverage ratio (as a percent) |  |  | 50.00% |  |
Unsecured revolving credit facility mature on July 13, 2021 | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt |  |  |  |  |
Interest spread on borrowings (as a percent) |  |  | 1.125% |  |
Unsecured revolving credit facility mature on July 13, 2021 | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |
Debt |  |  |  |  |
Interest spread on borrowings (as a percent) |  |  | 1.125% |  |
Unsecured revolving credit facility mature on July 13, 2021 | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |
Debt |  |  |  |  |
Interest spread on borrowings (as a percent) |  |  | 1.75% |  |
Unsecured revolving credit facility mature on July 13, 2021 | Letter of credit |  |  |  |  |
Debt |  |  |  |  |
Borrowing capacity |  |  | $ 75,000 |  |
Number of letters of credit outstanding | letter |  |  | 3 |  |
Letters of credit outstanding/issued |  |  | $ 39,300 |  |
Unsecured standalone line of credit facility |  |  |  |  |
Debt |  |  |  |  |
Maximum borrowing capacity |  |  | $ 12,000 |  |
Letters of credit outstanding/issued |  | $ 5,600 |  | $ 5,600 |
Number of bonds issued | item |  | 3 |  |  |
Number of bonds denominated in a foreign currency which rose in value | item |  | 2 |  |  |
Increase in bond value |  |  |  | $ 200 |

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- Definition Number of covenants that limit or prohibit certain actions or activities without the lender's prior consent within a specified period of time or until certain specified targets are achieved for example, reduction of the debt or an increase in net worth to a specified amount). + References No definition available. + Details
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- Definition Increase in bond value due to foreign currency translation during the period. + 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 Amount of long-term debt, before unamortized discount and debt issuance cost. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References No definition available. + Details
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- Definition It represents the maximum percentage of priority debt that can be allowed on the net worth of the Company. + References No definition available. + Details
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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/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 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 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 Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + 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 current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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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