Funded Status of Defined Benefit Pension and Post-Retirement Plans (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Oct. 02, 2015	Oct. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 425,781	$ 389,461
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(79,517)	(63,822)
Pension Plan | Benefit Obligation
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations	(505,298)	(453,283)	$ (473,348)
Pension Plan | Plan Assets - Fair Value
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	425,781	389,461	427,474
Pension Plan | Funded Status
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	425,781	389,461
Benefit obligations	(505,298)	(453,283)
Net amount recognized	(79,517)	(63,822)
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(13,236)	(12,187)
Other Postretirement Benefit Plan | Benefit Obligation
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations	(13,236)	(12,187)	(13,797)
Other Postretirement Benefit Plan | Plan Assets - Fair Value
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0	$ 0
Other Postretirement Benefit Plan | Funded Status
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Benefit obligations	(13,236)	(12,187)
Net amount recognized	$ (13,236)	$ (12,187)