Retirement Plans - Schedule of Net Periodic Benefit Costs (Detail) - Defined Benefit Plans - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 03, 2015	Jun. 27, 2014	Jul. 03, 2015	Jun. 27, 2014
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,180	$ 1,028	$ 3,551	$ 3,077
Interest cost	1,278	1,545	3,843	4,591
Expected return on plan assets	(1,791)	(1,977)	(5,385)	(5,869)
Amortization of prior service cost	45	43	138	128
Recognized actuarial loss	614	539	1,841	1,616
Net periodic benefit cost	$ 1,326	$ 1,178	$ 3,988	$ 3,543