Schedule of Net Periodic Pension Cost (Detail) - Pension Plans, Defined Benefit - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Apr. 01, 2016	Mar. 27, 2015	[1]	Apr. 01, 2016	Mar. 27, 2015	[1]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,945	$ 2,744		$ 5,902	$ 5,446
Interest cost	4,247	4,087		8,640	8,451
Expected return on plan assets	(5,993)	(6,249)		(11,904)	(12,716)
Settlement	0	0		0	2,991
Amortization of prior service cost	112	15		226	34
Amortization of actuarial (gain) loss	1,577	1,105		3,059	2,316
Net periodic cost (benefit)	$ 2,888	$ 1,702		$ 5,923	$ 6,522

[1] (Recast)