CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 403,703	$ 438,248	$ 427,049
Defined benefit pension and post-retirement benefit plans:
Net gain (loss) arising during the year, net of tax benefit (expense) of $930, ($1,504), and $1,079	(9,593)	5,549	(8,761)
Prior service cost arising during the year, net of tax expense of ($1,240)	2,078
Amortization of prior service cost included in net periodic benefit cost, net of tax benefit (expense) of ($27), $159 and ($19)	156	(145)	144
Amortization, settlement curtailment of net actuarial loss included in net periodic benefit cost, net of tax expense of ($529), ($608), and ($548)	3,380	3,138	3,114
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(3,979)	8,542	(5,503)
Unrealized gain on derivatives:
Increase (decrease) in unrealized gain / (loss), net of tax expense of ($1,467), ($191) and ($541)	2,458	318	900
Reclassification adjustments, net of tax benefit of $479, $923, and $217	(802)	(1,540)	(362)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	1,656	(1,222)	538
Currency translation adjustment	(16,217)	9,230	(4,808)
Other comprehensive earnings (loss)	(18,540)	16,550	(9,773)
Comprehensive earnings	$ 385,163	$ 454,798	$ 417,276