Discontinued Operations Income (Loss) Net of Tax (Detail) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended											11 Months Ended	12 Months Ended
	Oct. 02, 2015	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Sep. 25, 2015	Jul. 31, 2015	Jun. 26, 2015	May 01, 2015	Mar. 27, 2015	Jan. 30, 2015	Dec. 26, 2014	Oct. 02, 2015	Sep. 30, 2016	Oct. 02, 2015		Sep. 30, 2015	Oct. 31, 2014
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales													$ 72,402	$ 22,794	$ 83,231			$ 103,812
Operating earnings (loss)													(41,258)	(15,578)	(45,231)			(67,681)
Tax expense (benefit)													(4,205)	(312)	(4,912)			(5,070)
Income (loss) from discontinued operations	$ (17,718)	$ 227	$ (8,690)	$ (2,023)	$ (4,780)	$ (19,285)	$ (1,371)	$ (558)	$ (1,688)	$ (14,600)	$ (16,276)	$ (5,876)	(37,053)	(15,266)	(40,319)	[1]		(62,611)
Included in Operating Earnings (Loss):
Loss on net assets held for sale													(31,154)	(8,448)	(30,792)	[1]	$ (30,792)	(49,472)
Avionics & Controls
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales													40,835	17,572	47,603			55,447
Operating earnings (loss)													(24,591)	1,350	(24,004)			(24,035)
Tax expense (benefit)													(3,002)	1,487	(2,948)			(1,935)
Income (loss) from discontinued operations													(21,589)	(137)	(21,056)			(22,100)
Included in Operating Earnings (Loss):
Loss on net assets held for sale													(18,864)	(2,457)	(16,763)			(18,489)
Sensors & Systems
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales													18,684	0	21,221			22,479
Operating earnings (loss)													3,041	(379)	3,458			(12,856)
Tax expense (benefit)													626	(83)	814			(523)
Income (loss) from discontinued operations													2,415	(296)	2,644			(12,333)
Included in Operating Earnings (Loss):
Loss on net assets held for sale													(229)	0	(622)			(12,675)
Advanced Materials
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales													12,883	5,222	14,407			25,886
Operating earnings (loss)													(17,588)	(15,761)	(22,424)			(29,945)
Tax expense (benefit)													(1,104)	(1,448)	(2,456)			(2,316)
Income (loss) from discontinued operations													(16,484)	(14,313)	(19,968)			(27,629)
Included in Operating Earnings (Loss):
Loss on net assets held for sale													(12,061)	(5,991)	(13,407)			(18,308)
Other
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales													0	0	0			0
Operating earnings (loss)													(2,120)	(788)	(2,261)			(845)
Tax expense (benefit)													(725)	(268)	(322)			(296)
Income (loss) from discontinued operations													(1,395)	(520)	(1,939)			(549)
Included in Operating Earnings (Loss):
Loss on net assets held for sale													$ 0	$ 0	$ 0			$ 0

[1] (Recast)