Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Derivative, Notional Amount, Quarterly Reduction, Amount. Expressed as an absolute value.

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- Definition

Leverage Ratio

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No definition available.

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- Definition

Credit Facility Fixed Charge Coverage Ratio

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No definition available.

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- Definition

Maximum possible value of increase in 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.

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No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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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.

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No definition available.

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Amount of the required periodic payments including both interest and principal payments.

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- Definition

Weighted average interest rate of debt outstanding.

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No definition available.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Fixed interest rate related to the interest rate derivative.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
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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

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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.

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No definition available.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Long-term Debt and Financing Arrangements - Narrative (Details)		1 Months Ended	3 Months Ended	9 Months Ended	57 Months Ended
	Aug. 31, 2018 USD ($)	Apr. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2023 USD ($)	Aug. 30, 2018 USD ($)	Dec. 31, 2017	Jul. 06, 2016 USD ($)
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)			2.90%	2.90%			2.20%
Interest Rate Swap
Debt Instrument [Line Items]
Derivative agreement term		3 years
Derivative notional amount		$ 60,000,000.0
Fixed rate of derivatives (as a percent)		1.58%
Quarterly reduction to notional amount			$ 5,000,000.0
Amended Credit Facility
Debt Instrument [Line Items]
Borrowings outstanding under term loan			250,000,000	$ 250,000,000
Outstanding standby letters of credit			3,900,000	3,900,000
Term Loan Due August 31, 2023
Debt Instrument [Line Items]
Borrowings outstanding under term loan			200,000,000	200,000,000
Debt issuance costs			500,000	500,000
Revolving Credit Facility \| Amended Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 450,000,000		$ 450,000,000.0	$ 450,000,000.0		$ 175,000,000		$ 450,000,000
Maximum borrowing capacity possible value of increase (not to exceed)	$ 150,000,000
Credit facility fixed charge coverage ratio (not less than)				1.25
Required consolidated leverage ratio as of end of each fiscal quarter (no greater than)			3.5	3.5
Remaining borrowing capacity			$ 108,100,000	$ 108,100,000
Outstanding borrowings			338,000,000	$ 338,000,000
Revolving Credit Facility \| Amended Credit Facility \| Minimum
Debt Instrument [Line Items]
Quarterly unused line commitment fee (as a percent)				0.15%
Revolving Credit Facility \| Amended Credit Facility \| Maximum
Debt Instrument [Line Items]
Quarterly unused line commitment fee (as a percent)				0.275%
Revolving Credit Facility \| Amended Credit Facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.00%
Revolving Credit Facility \| Amended Credit Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.25%
Revolving Credit Facility \| Amended Credit Facility \| Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.50%
Revolving Credit Facility \| Amended Credit Facility \| Eurocurrency Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.00%
Revolving Credit Facility \| Amended Credit Facility \| Eurocurrency Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.75%
Revolving Credit Facility \| Amended Credit Facility \| Eurocurrency Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				2.00%
Foreign Credit Facility
Debt Instrument [Line Items]
Remaining borrowing capacity			8,400,000	$ 8,400,000
Outstanding borrowings			100,000	100,000
Outstanding standby letters of credit			$ 2,300,000	$ 2,300,000
Subsequent Event \| Term Loan Due August 31, 2023
Debt Instrument [Line Items]
Amount of quarterly repayments of term commitment					$ 2,500,000