Stockholders' Equity (Comprehensive Income, Net Of Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 28, 2014	Jul. 06, 2014	Apr. 13, 2014	Sep. 29, 2013	Jul. 07, 2013	Apr. 14, 2013	Jan. 19, 2014	Jan. 20, 2013	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2012
Stockholders' Equity [Line Items]
Net earnings	$ 16,160	$ 24,703	$ 15,801	$ 22,828	$ (5,656)	$ 13,291	$ 32,286	$ 20,689	$ 88,950	$ 51,152	$ 57,651
Cash flow hedges, Net change in fair value of derivatives									(1,890)	(110)	(1,055)
Cash flow hedges, Net loss reclassified to earnings									(1,291)	(1,353)	(1,304)
Cash flow hedges, Total									(599)	1,243	249
Cash flow hedges, Tax effect									(229)	476	97
Cash flow hedges, Net of tax									(370)	767	152
Unrecognized periodic benefit costs, Actuarial losses arising during the period									49,173	(98,764)	78,619
Unrecognized periodic benefit costs, Total									43,928	(117,659)	65,087
Comprehensive income									61,480	124,503	17,578
Interest Rate Swaps [Member] | Derivatives Designated As Hedging Instrument [Member]
Stockholders' Equity [Line Items]
Cash flow hedges, Net change in fair value of derivatives									$ (1,890)	$ (110)	$ (1,055)