Retirement Plans - Schedule of Net Periodic Benefit Costs (Detail) (Defined Benefit Plans, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014
Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,184	$ 1,026	$ 2,371	$ 2,049
Interest cost	1,270	1,532	2,565	3,046
Expected return on plan assets	(1,778)	(1,957)	(3,594)	(3,892)
Amortization of prior service cost	46	42	93	85
Recognized actuarial loss	613	538	1,227	1,077
Net periodic benefit cost	$ 1,335	$ 1,181	$ 2,662	$ 2,365