Stockholders' Equity - Schedule of Amounts Reclassified Out of Other Comprehensive Earnings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2015	Sep. 26, 2014	Sep. 27, 2013
Net Unrealized Gains (Losses) Defined Benefit Pension and Post-Retirement Benefit Plans
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Total amounts reclassified out of other comprehensive earnings	$ (2,099)	$ (2,316)	$ (2,950)
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Total amounts reclassified out of other comprehensive earnings	3,780	1,281	2,463
Accumulated Other Comprehensive Earnings (Loss)
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Total amounts reclassified out of other comprehensive earnings	1,681	(1,035)	(487)
Cost of revenues & Operating expenses | Net Unrealized Gains (Losses) Defined Benefit Pension and Post-Retirement Benefit Plans
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Total amounts reclassified out of other comprehensive earnings	2,099	2,316	2,950
Revenues | Net Unrealized Gains (Losses) Cash Flow Hedging Instruments
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Total amounts reclassified out of other comprehensive earnings	$ 3,780	$ 1,281	$ 2,463