Amount of purchase price paid into an escrow account to fund potential indemnity claims by buyer against seller

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- Definition

Period of Time from Acquisition Date for Indemnity Claims.

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No definition available.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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No definition available.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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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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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
Acquisitions (Narrative) (Details) - USD ($) $ in Thousands	Apr. 04, 2016	Jul. 01, 2016	Mar. 31, 2017	Sep. 30, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015
Business Acquisition [Line Items]
Goodwill			$ 11,182	$ 11,196	$ 16,672		$ 14,292
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			7 years 6 months
Diving [Member]
Business Acquisition [Line Items]
Goodwill		$ 0
Goodwill, Impairment Loss		$ 6,197
SeaBear [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition			Oct. 27, 2015
Goodwill			$ 2,219
Period to Date Acquisition Transaction Costs						$ 301
Northport [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition			Apr. 04, 2016
Indemnity Escrow Amount	$ 500
Goodwill			$ 827
Period of Time from Acquisition Date for Indemnity Claims			24 months
Business Combination, Contingent Consideration, Liability			$ 250