Discontinued Operations Income (Loss) Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jan. 01, 2016	Dec. 26, 2014
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales	$ 8,066	$ 23,531
Operating earnings (loss)	(2,739)	(8,038)
Gain (loss) on net assets held for sale	(2,517)	0	[1]
Tax expense (benefit)	(476)	(2,091)
Income (loss) from discontinued operations	(4,780)	(5,947)	[1]
Avionics & Controls
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales	5,582	14,162
Operating earnings (loss)	1,167	(845)
Gain (loss) on net assets held for sale	(270)	0
Tax expense (benefit)	413	(407)
Income (loss) from discontinued operations	484	(438)
Sensors & Systems
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales	0	5,928
Operating earnings (loss)	(156)	300
Gain (loss) on net assets held for sale	0	0
Tax expense (benefit)	0	148
Income (loss) from discontinued operations	(156)	152
Advanced Materials
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales	2,484	3,441
Operating earnings (loss)	(3,746)	(6,985)
Gain (loss) on net assets held for sale	(2,247)	0
Tax expense (benefit)	(889)	(1,656)
Income (loss) from discontinued operations	(5,104)	(5,329)
Other
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Sales	0	0
Operating earnings (loss)	(4)	(508)
Gain (loss) on net assets held for sale	0	0
Tax expense (benefit)	0	(176)
Income (loss) from discontinued operations	$ (4)	$ (332)

[1] (Recast)