Retirement Plans (Defined Contribution Plan) (Details) - Defined Contribution Plan, 401 K [Member] - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of match	50.00%
Defined Contribution Plan, Cost Recognized	$ 25.3	$ 22.1	$ 19.0

The amount of the cost recognized during the period for defined contribution plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration