Schedule of Amounts Reclassified Out of Other Comprehensive Earnings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 28, 2014	Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Revenues	$ 778,506	$ 768,358	$ 1,490,008	$ 1,446,756
Earnings before taxes	128,147	156,383	270,513	294,546
Reclassification Out of Other Comprehensive Earnings
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Earnings before taxes	1,049	(536)	119	(513)
Reclassification Out of Other Comprehensive Earnings | Net Unrealized Gains (Losses) Defined benefit pension and post-retirement benefit plans
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Cost of Revenues & Operating Expenses	(578)	(738)	(1,158)	(1,475)
Reclassification Out of Other Comprehensive Earnings | Net Unrealized Gains (Losses) Cash Flow Hedging Instruments
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Revenues	$ 1,627	$ 202	$ 1,277	$ 962