Business Segment Information for Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								11 Months Ended		12 Months Ended
	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015		Sep. 29, 2017		Sep. 30, 2016		Oct. 02, 2015
Segment Reporting Information [Line Items]
Sales	$ 531,527	$ 503,753	$ 509,182	$ 457,733	$ 543,752	$ 517,092	$ 490,310	$ 441,477	$ 1,774,449	[1]	$ 2,002,195	[1]	$ 1,992,631	[1]	$ 2,002,793	[2]
Other income									12,503		0		0		12,503	[2]
Interest income									578		527		367		632	[2]
Interest expense									(30,090)		(30,208)		(30,091)		(33,114)	[2]
Loss on extinguishment of debt									(11,451)		0		0		(11,451)	[2]
Earnings from Continuing Operations Before Income Taxes									116,022		165,130		140,435		155,233	[2]
Avionics & Controls
Segment Reporting Information [Line Items]
Sales									727,801		841,077		860,494		826,044
Sensors & Systems
Segment Reporting Information [Line Items]
Sales									633,446		725,964		696,032		714,965
Advanced Materials
Segment Reporting Information [Line Items]
Sales									413,202		435,154		436,105		461,784
Operating Segments
Segment Reporting Information [Line Items]
Segment Earnings									218,648		264,843		240,639		268,794
Operating Segments | Avionics & Controls
Segment Reporting Information [Line Items]
Segment Earnings									65,910		94,468		78,356		93,225
Operating Segments | Sensors & Systems
Segment Reporting Information [Line Items]
Segment Earnings									71,787		96,484		87,768		84,235
Operating Segments | Advanced Materials
Segment Reporting Information [Line Items]
Segment Earnings									80,951		73,891		74,515		91,334
Corporate Non Segment
Segment Reporting Information [Line Items]
Corporate expense									$ (74,166)		$ (70,032)		$ (70,480)		$ (82,131)

[1] Based on country from which the sale originated and the sale was recorded.

[2] (Recast)