Changes in Goodwill by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
Sep. 28, 2018	Sep. 29, 2017
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 1,053,573	$ 1,024,667
Sale of business	(7,022)
Foreign currency translation adjustment	(15,884)	28,906
Goodwill, Ending Balance	1,030,667	1,053,573
Avionics & Controls
Goodwill [Line Items]
Goodwill, Beginning Balance	456,018	442,794
Sale of business	0
Foreign currency translation adjustment	(8,491)	13,224
Goodwill, Ending Balance	447,527	456,018
Sensors & Systems
Goodwill [Line Items]
Goodwill, Beginning Balance	399,833	385,567
Sale of business	0
Foreign currency translation adjustment	(6,159)	14,266
Goodwill, Ending Balance	393,674	399,833
Advanced Materials
Goodwill [Line Items]
Goodwill, Beginning Balance	197,722	196,306
Sale of business	(7,022)
Foreign currency translation adjustment	(1,234)	1,416
Goodwill, Ending Balance	$ 189,466	$ 197,722

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Publisher FASB
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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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