Significant Accounting Policies (Stock-based Compensation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 26, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 32,370	$ 41,412	$ 43,400
Restricted Stock and Restricted Stock Units (excluding Market and Performance Awards)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	21,156	20,779	17,307
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	7,165	10,683	10,829
Market and Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 4,049	$ 9,950	$ 15,264