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Seasonal Financing - Narrative (Details) - Revolving Credit Facility - Credit Agreement | Dec. 20, 2017 USD ($) trading_day | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Debt Instrument [Line Items] |  |  |
Aggregate commitment under the credit facility | $ 1,600,000,000 |  |
Outstanding borrowings |  | $ 275,000,000 | $ 0
Equity interest subject to a lien (as a percent) | 100.00% |  |
Voting stock subject to a lien (as a percent) | 65.00% |  |
Interest coverage ratio minimum for covenant compliance | 1.00 |  |
Excess availability under credit facility | $ 100,000,000 |  |
Availability threshold (as a percent) | 10.00% |  |
Threshold consecutive trading days | trading_day | 30 |  |
Minimum | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate margin for loans (as a percent) | 1.25% |  |
Minimum | Base Rate |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate margin for loans (as a percent) | 0.25% |  |
Maximum | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate margin for loans (as a percent) | 3.00% |  |
Maximum | Base Rate |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate margin for loans (as a percent) | 2.00% |  |

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- Definition Contingency under Credit Agreement, Availability Threshold, Percent + References No definition available. + Details
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- Definition Contingency under Credit Agreement, Excess Availability under Credit Facility + References No definition available. + Details
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- Definition Percentage of Equity Interest Subject to a Lien + References No definition available. + Details
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- Definition Percentage of Voting Stock Subject to a Lien + 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 Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature. + References No definition available. + 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 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 The carrying value as of the balance sheet date of the current portion 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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