Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss, Net [Member]	Treasury Stock [Member]
Comprehensive income:
Stockholders' Equity Attributable to Parent	$ 257,911	$ 801	$ 356,727	$ 1,244,897	$ (90,132)	$ (1,254,382)
Shares, Outstanding		80,127,387.000
Balance, shares at Sep. 28, 2014		80,127,387.000
Balance at Sep. 28, 2014	257,911	$ 801	356,727	1,244,897	(90,132)	(1,254,382)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under stock plans including tax benefit		968,769
Shares issued under stock plans, including tax benefit	33,772	$ 10	33,762
Share-based compensation	12,420		12,420
Dividends declared	(37,513)		77	(37,590)
Purchases of treasury stock	(317,051)					(317,051)
Comprehensive income:
Net earnings	108,812			108,812
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(29)				(29)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(15,068)				(15,068)
Effect of actuarial losses and prior service cost, net	(27,301)				(27,301)
Stockholders' Equity Attributable to Parent	257,911	$ 801	356,727	1,244,897	(90,132)	(1,254,382)
Shares, Outstanding		80,127,387.000
Stockholders' Equity Attributable to Parent	15,953	$ 811	402,986	1,316,119	(132,530)	(1,571,433)
Shares, Outstanding		81,096,156
Balance, shares at Sep. 27, 2015		81,096,156
Balance at Sep. 27, 2015	15,953	$ 811	402,986	1,316,119	(132,530)	(1,571,433)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under stock plans including tax benefit		502,368
Shares issued under stock plans, including tax benefit	18,025	$ 5	18,020
Share-based compensation	11,455		11,455
Dividends declared	(40,368)		103	(40,471)
Purchases of treasury stock	(291,853)					(291,853)
Comprehensive income:
Net earnings	124,073			124,073
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(43)				(43)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(13,110)				(13,110)
Effect of actuarial losses and prior service cost, net	(41,338)				(41,338)
Stockholders' Equity Attributable to Parent	15,953	$ 811	402,986	1,316,119	(132,530)	(1,571,433)
Shares, Outstanding		81,096,156
Stockholders' Equity Attributable to Parent	(217,206)	$ 816	432,564	1,399,721	(187,021)	(1,863,286)
Shares, Outstanding		81,598,524
Balance, shares at Oct. 02, 2016		81,598,524
Balance at Oct. 02, 2016	(217,206)	$ 816	432,564	1,399,721	(187,021)	(1,863,286)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under stock plans including tax benefit		244,959
Shares issued under stock plans, including tax benefit	9,397	$ 2	9,395
Share-based compensation	11,416		11,416
Dividends declared	(49,078)		155	(49,233)
Purchases of treasury stock	(327,153)					(327,153)
Comprehensive income:
Net earnings	135,332			135,332
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(22)				(22)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	15,246				15,246
Effect of actuarial losses and prior service cost, net	34,036				34,036
Stockholders' Equity Attributable to Parent	(217,206)	$ 816	432,564	1,399,721	(187,021)	(1,863,286)
Shares, Outstanding		81,598,524
Stockholders' Equity Attributable to Parent	$ (388,032)	$ 818	$ 453,530	$ 1,485,820	$ (137,761)	$ (2,190,439)
Shares, Outstanding		81,843,483