Discontinued Operations Income (Loss) Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended
	Apr. 01, 2016	Jan. 01, 2016	May. 01, 2015	Mar. 27, 2015		Apr. 01, 2016	May. 01, 2015	Mar. 27, 2015
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales	$ 6,768			$ 22,467		$ 14,834		$ 45,998
Operating earnings (loss)	(1,960)			(14,591)		(7,216)		(22,559)
Tax expense (benefit)	63			9		(413)		(2,083)
Income (loss) from discontinued operations	(2,023)		$ (14,600)	(14,600)	[1]	(6,803)	$ (20,500)	(20,476)	[1]
Included in Operating Earnings (Loss):
Gain (loss) on net assets held for sale	(1,055)			(14,447)		(3,572)		(14,447)	[1]
Avionics & Controls
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales	4,479			13,429		10,061		27,591
Operating earnings (loss)	1,072			(10,624)		1,969		(11,395)
Tax expense (benefit)	273			318		686		(89)
Income (loss) from discontinued operations	799			(10,942)		1,283		(11,306)
Included in Operating Earnings (Loss):
Gain (loss) on net assets held for sale	326			(11,439)		56		(11,439)
Sensors & Systems
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales	0			6,329		0		12,257
Operating earnings (loss)	(151)			1,449		(307)		1,749
Tax expense (benefit)	0			524		0		672
Income (loss) from discontinued operations	(151)			925		(307)		1,077
Included in Operating Earnings (Loss):
Gain (loss) on net assets held for sale	0			0		0		0
Advanced Materials
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales	2,289			2,709		4,773		6,150
Operating earnings (loss)	(2,874)			(4,236)		(8,867)		(11,221)
Tax expense (benefit)	(210)			(420)		(1,099)		(2,076)
Income (loss) from discontinued operations	(2,664)			(3,816)		(7,768)		(9,145)
Included in Operating Earnings (Loss):
Gain (loss) on net assets held for sale	(1,381)	$ (2,200)		(3,008)		(3,628)		(3,008)
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)	(7)			(1,180)		(11)		(1,692)
Tax expense (benefit)	0			(413)		0		(590)
Income (loss) from discontinued operations	(7)			(767)		(11)		(1,102)
Included in Operating Earnings (Loss):
Gain (loss) on net assets held for sale	$ 0			$ 0		$ 0		$ 0

[1] (Recast)