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Debt (Details) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Mar. 19, 2015 USD ($) | Mar. 31, 2016 USD ($) item | Sep. 30, 2015 USD ($)
Debt |  |  |
Unsecured long-term debt |  | $ 540,000 | $ 540,000
Less long-term debt due within one year |  | 40,000 | 40,000
Long-term debt |  | 500,000 | 500,000
Unamortized discount and debt issuance costs |  | (7,937) | (8,463)
Less unamortized debt issuance costs |  | (856) | (906)
Unamortized discount and debt issuance costs, noncurrent |  | $ (7,081) | (7,557)
Issued to support international operations |  |  |
Debt |  |  |
Number of letters of credit outstanding | item |  | 2 |
Letters of credit outstanding/issued |  | $ 12,000 |
Unsecured revolving credit facility mature May 25, 2017 |  |  |
Debt |  |  |
Borrowing amount |  | $ 300,000 |
Commitment fee (as a percent) |  | 0.15% |
Borrowing amount outstanding |  | $ 0 |
Available borrowing capacity excluding letters of credit transaction |  | $ 259,700 |
Unsecured revolving credit facility mature May 25, 2017 | Minimum |  |  |
Debt |  |  |
Interest coverage ratio |  | 3.00 |
Commitment fee (as a percent) |  | 0.15% |
Unsecured revolving credit facility mature May 25, 2017 | Maximum |  |  |
Debt |  |  |
Funded leverage ratio (as a percent) |  | 50.00% |
Commitment fee (as a percent) |  | 0.35% |
Unsecured revolving credit facility mature May 25, 2017 | London Interbank Offered Rate (LIBOR) |  |  |
Debt |  |  |
LIBOR spread on borrowings (as a percent) |  | 1.125% |
Unsecured revolving credit facility mature May 25, 2017 | London Interbank Offered Rate (LIBOR) | Minimum |  |  |
Debt |  |  |
LIBOR spread on borrowings (as a percent) |  | 1.125% |
Unsecured revolving credit facility mature May 25, 2017 | London Interbank Offered Rate (LIBOR) | Maximum |  |  |
Debt |  |  |
LIBOR spread on borrowings (as a percent) |  | 1.75% |
Unsecured revolving credit facility mature May 25, 2017 | Letter of credit |  |  |
Debt |  |  |
Available borrowing capacity to use for letters of credit |  | $ 100,000 |
Number of letters of credit outstanding | item |  | 3 |
Letters of credit outstanding/issued |  | $ 40,300 |
Unsecured senior notes issued July 21, 2009 |  |  |
Debt |  |  |
Unsecured long-term debt |  | $ 40,000 |
Long-term debt stated interest rate percentage |  | 6.10% |
Annual principal repayments |  | $ 40,000 |
Unsecured senior notes issued July 21, 2009 | Minimum |  |  |
Debt |  |  |
Interest coverage ratio |  | 2.50 |
Unsecured senior notes issued July 21, 2009 | Maximum |  |  |
Debt |  |  |
Funded leverage ratio (as a percent) |  | 55.00% |
Due July 21, 2016 |  |  |
Debt |  |  |
Unsecured long-term debt |  | $ 40,000 | 40,000
Unamortized discount and debt issuance costs |  | (335) | (498)
Unsecured senior notes issued March 19, 2015 |  |  |
Debt |  |  |
Unsecured long-term debt |  | 500,000 | 500,000
Unamortized discount and debt issuance costs |  | $ (7,602) | $ (7,965)
Long-term debt stated interest rate percentage | 4.65% |  |
Debt issued | $ 500,000 |  |
Term of debt | 10 years |  |

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- Definition Represents the interest coverage ratio required by financial covenants under the terms of the debt agreement. + 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 debt issuance cost, scheduled to be repaid within one year or the normal operating cycle, if longer. + 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 The noncurrent portion of the remaining balance of debt discount and issuance costs that were capitalized and are being amortized against income over the lives of the respective bond issues. + References No definition available. + Details
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- Definition The current portion of the remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. + References No definition available. + Details
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- Definition The remaining balance of debt issuance expenses current and noncurrent that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + 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://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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + 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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