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Debt, Capital Lease Obligations and Other Financing - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2018 | Apr. 01, 2017 | Sep. 30, 2017
Debt Instrument [Line Items] |  |  |  |
Amount of debt outstanding | $ 175,000,000 | $ 175,000,000 |  | $ 283,000,000
Amount borrowed |  | 504,616,000 | $ 97,926,000 |
Debt, Fair Value | 176,400,000 | 176,400,000 |  | 284,500,000
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum commitment | 300,000,000.0 | 300,000,000.0 |  |
Amount credit facility may be further increased | $ 500,000,000.0 | 500,000,000.0 |  |
Highest daily borrowings |  | 208,000,000 |  |
Average daily borrowings |  | 108,500,000 |  |
Annual commitment fee | 0.175% |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of debt outstanding | $ 0 | 0 |  | $ 108,000,000
Amount borrowed |  | 503,500,000 |  |
Amount repaid |  | $ 611,500,000 |  |
5.20% Senior Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 5.20% | 5.20% |  | 5.20%
Amount of debt outstanding | $ 175,000,000 | $ 175,000,000 |  | $ 175,000,000

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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 The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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