Face (par) amount of debt instrument at time of issuance.

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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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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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- 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.

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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.

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Financing Agreement - Additional Information (Detail) - USD ($)	1 Months Ended
	Dec. 31, 2013	Dec. 31, 2010	Sep. 30, 2018	Jul. 31, 2018	Dec. 31, 2017	Nov. 30, 2016	Sep. 30, 2015	Aug. 31, 2011
Senior Notes \| Senior Unsecured Notes 3.81% Due May 2018
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		$ 25,000,000
Long-term debt			$ 0		$ 25,000,000
Senior Notes \| Senior Unsecured Notes 4.60% Due May 2021
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		$ 75,000,000
Long-term debt			75,000,000		75,000,000
Senior Notes \| Senior Unsecured Notes 3.13% Due December 2020
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 100,000,000
Long-term debt			100,000,000		100,000,000
Senior Notes \| Senior Unsecured Notes 4.23% Due July 2028
Debt Instrument [Line Items]
Long-term debt			350,000,000		0
Notes payable, other \| Boat Holdings, LLC
Debt Instrument [Line Items]
Long-term debt			76,733,000
Notes payable to banks
Debt Instrument [Line Items]
Long-term debt			87,608,000		12,384,000
Notes payable to banks \| Mortgages [Member]
Debt Instrument [Line Items]
Long-term debt			10,875,000				$ 14,500,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			600,000,000	$ 700,000,000			$ 500,000,000	$ 350,000,000
Revolving loan facility			74,023,000		3,000,000
Term loan
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 1,180,000,000		$ 750,000,000
Debt Instrument, Face Amount			500,000,000
Revolving loan facility			1,165,000,000		$ 680,000,000
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months			$ 59,000,000