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]
Balance at Sep. 30, 2012	$ 411,945	$ 758	$ 221,100	$ 1,120,671	$ (136,013)	$ (794,571)
Balance, shares at Sep. 30, 2012		75,827,894
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under stock plans, including tax benefit	64,299	$ 27	64,272
Shares issued in connection with director retirements		2,687,277
Share-based compensation	11,392		11,392
Purchases of treasury stock	(140,121)					(140,121)
Comprehensive income:
Net earnings	51,152			51,152
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	4				4
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	767				767
Effect of actuarial losses and prior service cost, net	72,580				72,580
Comprehensive income	124,503
Balance at Sep. 29, 2013	472,018	$ 785	296,764	1,171,823	(62,662)	(934,692)
Balance, shares at Sep. 29, 2013		78,515,171
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under stock plans, including tax benefit	49,621	$ 16	49,605
Shares issued in connection with director retirements		1,612,216
Share-based compensation	10,358		10,358
Dividends declared	(15,876)			(15,876)
Purchases of treasury stock	(319,690)					(319,690)
Comprehensive income:
Net earnings	88,950			88,950
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	7				7
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(370)				(370)
Effect of actuarial losses and prior service cost, net	(27,107)				(27,107)
Comprehensive income	61,480
Balance at Sep. 28, 2014	257,911	$ 801	356,727	1,244,897	(90,132)	(1,254,382)
Balance, shares at Sep. 28, 2014		80,127,387.000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under stock plans, including tax benefit	33,772	$ 10	33,762
Shares issued in connection with director retirements		968,769
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)
Comprehensive income	66,414
Balance at Sep. 27, 2015	$ 15,953	$ 811	$ 402,986	$ 1,316,119	$ (132,530)	$ (1,571,433)
Balance, shares at Sep. 27, 2015		81,096,156