Stockholders' Equity - Schedule of Amounts Reclassified Out of Other Comprehensive Earnings (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 03, 2015	Jun. 27, 2014	Jul. 03, 2015	Jun. 27, 2014
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Revenues	$ 784,011	$ 747,685	$ 2,281,271	$ 2,237,693
Reclassification Out of Other Comprehensive Earnings
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Total amounts reclassified out of other comprehensive earnings	152	(818)	1,818	(699)
Reclassification Out of Other Comprehensive Earnings | Unrealized loss on 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	(541)	(579)	(1,623)	(1,737)
Reclassification Out of Other Comprehensive Earnings | Unrealized gain (loss) on cash flow hedging instruments
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Revenues	$ 693	$ (239)	$ 3,441	$ 1,038