Goodwill (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
Apr. 01, 2016	Oct. 02, 2015	Apr. 03, 2015	Oct. 03, 2014
Evaluation of long-lived assets, period	5 years
Goodwill	$ 16,672	$ 14,292	$ 14,309	$ 14,416
Diving [Member]
Fair value exceeding its carrying value	$ 9

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant