Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands	1 Months Ended	3 Months Ended												12 Months Ended
	Jul. 23, 2015	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 26, 2014	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
Numerator for Basic and Diluted EPS:
Net income		$ 94,141,000	$ 89,032,000	$ 50,018,000	$ 60,536,000	$ 29,644,000	$ 69,055,000	$ 65,250,000	$ 46,514,000	$ 29,863,000	$ 91,062,000	$ 81,967,000	$ 100,079,000	$ 293,727,000	$ 210,463,000	$ 302,971,000
Net income allocated to participating securities														(3,077,000)
Net income allocated to common stock for EPS calculation														$ 290,650,000	$ 210,463,000	$ 302,971,000
Denominator for Basic and Diluted EPS:
Weighted average basic shares														119,370	120,133	125,007
Effect of dilutive securities:
Stock compensation plans														777	680	481
Restricted stock														1,319	670	622
Diluted shares														121,466	121,483	126,110
Shares allocated to participating securities														(1,319)
Shares used for calculating diluted EPS attributable to common stock														120,147	121,483	126,110
Basic EPS		$ 0.78	$ 0.74	$ 0.41	$ 0.50	$ 0.25	$ 0.58	$ 0.54	$ 0.38	$ 0.25	$ 0.74	$ 0.65	$ 0.78	$ 2.43	$ 1.75	$ 2.42
Diluted EPS		$ 0.78	$ 0.74	$ 0.41	$ 0.50	$ 0.24	$ 0.57	$ 0.54	$ 0.38	$ 0.24	$ 0.73	$ 0.64	$ 0.77	$ 2.42	$ 1.73	$ 2.40
Share Repurchases
Amount authorized to be repurchased	$ 500,000,000
Average cost per share repurchased ($ per share)	$ 55.60
Number of shares repurchased (in shares)	1,748