Benefit Obligations of Defined Benefit Pension and Post-Retirement Plans (Detail) - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
	Oct. 02, 2015	Sep. 29, 2017	Sep. 30, 2016
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11,811	$ 15,108	$ 12,861
Interest cost	16,159	15,553	18,095
Pension Plan | Benefit Obligation
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		505,298	453,283
Currency translation adjustment		9,340	268
Service cost		15,108	12,861
Interest cost		15,553	18,095
Plan participants contributions		318	376
Actuarial (gain) loss		(11,420)	44,136
Other adjustments		(1,254)	(859)
Benefits paid		(23,687)	(22,862)
Ending balance	453,283	509,256	505,298
Pension Plan | Plan Assets - Fair Value
Defined Benefit Plan Disclosure [Line Items]
Other adjustments		0	1,466
Pension Plan | Funded Status
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		505,298
Ending balance		509,256	505,298
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	359	385	342
Interest cost	464	335	473
Other Postretirement Benefit Plan | Benefit Obligation
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		13,236	12,187
Currency translation adjustment		665	26
Service cost		385	342
Interest cost		335	473
Plan participants contributions		0	0
Actuarial (gain) loss		(529)	738
Other adjustments		0	0
Benefits paid		(550)	(530)
Ending balance	$ 12,187	13,542	13,236
Other Postretirement Benefit Plan | Plan Assets - Fair Value
Defined Benefit Plan Disclosure [Line Items]
Other adjustments		0	0
Other Postretirement Benefit Plan | Funded Status
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		13,236
Ending balance		$ 13,542	$ 13,236